LazyConnectionDataSourceProxy.java
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|---|---|---|
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org.springframework.jdbc.datasource |
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Spring Framework |
View: Reasons, Metrics, Source Code
These are the metrics that contribute to the Enerjy Score for this file, ranked by impact. So the metrics listed at the top influence the score to a greater extent that the metrics listed at the bottom.
| Metric | Description | |
|---|---|---|
| LINE_COMMENT | Number of line comments |  |
| EXEC_COMMENTS | Comments in executable code | |
| JAVA0034 | JAVA0034 Missing braces in if statement | |
| RETURNS | Number of return points from functions | |
| JAVA0128 | JAVA0128 Public constructor in non-public class | |
| JAVA0110 | JAVA0110 Incorrect javadoc: no @return tag | |
| JAVA0115 | JAVA0115 Incorrect javadoc: no @throws or @exception tag for 'exception' | |
| JAVA0278 | JAVA0278 Unnecessary use of Boolean constructor | |
| DOC_COMMENT | Number of javadoc comment lines | |
| COMMENTS | Comment lines | |
| JAVA0108 | JAVA0108 Incorrect javadoc: no @param tag for 'parameter' | |
| SIZE | Size of the file in bytes | |
| JAVA0143 | JAVA0143 Synchronized method | |
| PROGRAM_VOLUME | Halstead program volume | |
| JAVA0126 | JAVA0126 Method declares unchecked exception in throws | |
| INTERFACE_COMPLEXITY | Interface complexity | |
| UNIQUE_OPERATORS | Number of unique operators | |
| LOOPS | Number of loops | |
| COMPARISONS | Number of comparison operators | |
/*
* Copyright 2002-2008 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.jdbc.datasource;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.sql.Connection;
import java.sql.SQLException;
import javax.sql.DataSource;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.core.Constants;
/**
* Proxy for a target DataSource, fetching actual JDBC Connections lazily,
* i.e. not until first creation of a Statement. Connection initialization
* properties like auto-commit mode, transaction isolation and read-only mode
* will be kept and applied to the actual JDBC Connection as soon as an
* actual Connection is fetched (if ever). Consequently, commit and rollback
* calls will be ignored if no Statements have been created.
*
* <p>This DataSource proxy allows to avoid fetching JDBC Connections from
* a pool unless actually necessary. JDBC transaction control can happen
* without fetching a Connection from the pool or communicating with the
* database; this will be done lazily on first creation of a JDBC Statement.
*
* <p><b>If you configure both a LazyConnectionDataSourceProxy and a
* TransactionAwareDataSourceProxy, make sure that the latter is the outermost
* DataSource.</b> In such a scenario, data access code will talk to the
* transaction-aware DataSource, which will in turn work with the
* LazyConnectionDataSourceProxy.
*
* <p>Lazy fetching of physical JDBC Connections is particularly beneficial
* in a generic transaction demarcation environment. It allows you to demarcate
* transactions on all methods that could potentially perform data access,
* without paying a performance penalty if no actual data access happens.
*
* <p>This DataSource proxy gives you behavior analogous to JTA and a
* transactional JNDI DataSource (as provided by the J2EE server), even
* with a local transaction strategy like DataSourceTransactionManager or
* HibernateTransactionManager. It does not add value with Spring's
* JtaTransactionManager as transaction strategy.
*
* <p>Lazy fetching of JDBC Connections is also recommended for read-only
* operations with Hibernate, in particular if the chances of resolving the
* result in the second-level cache are high. This avoids the need to
* communicate with the database at all for such read-only operations.
* You will get the same effect with non-transactional reads, but lazy fetching
* of JDBC Connections allows you to still perform reads in transactions.
*
* <p><b>NOTE:</b> This DataSource proxy needs to return wrapped Connections to
* handle lazy fetching of an actual JDBC Connection. Therefore, the returned
* Connections cannot be cast to a native JDBC Connection type like OracleConnection,
* or to a connection pool implementation type. Use a corresponding
* NativeJdbcExtractor to retrieve the native JDBC Connection.
*
* @author Juergen Hoeller
* @since 1.1.4
* @see ConnectionProxy
* @see DataSourceTransactionManager
* @see org.springframework.orm.hibernate3.HibernateTransactionManager
* @see org.springframework.jdbc.support.nativejdbc.NativeJdbcExtractor
*/
public class LazyConnectionDataSourceProxy extends DelegatingDataSource {
/** Constants instance for TransactionDefinition */
private static final Constants constants = new Constants(Connection.class);
private static final Log logger = LogFactory.getLog(LazyConnectionDataSourceProxy.class);
private Boolean defaultAutoCommit;
private Integer defaultTransactionIsolation;
/**
* Create a new LazyConnectionDataSourceProxy.
* @see #setTargetDataSource
*/
public LazyConnectionDataSourceProxy() {
}
/**
* Create a new LazyConnectionDataSourceProxy.
* @param targetDataSource the target DataSource
*/
public LazyConnectionDataSourceProxy(DataSource targetDataSource) {
setTargetDataSource(targetDataSource);
afterPropertiesSet();
}
/**
* Set the default auto-commit mode to expose when no target Connection
* has been fetched yet (-> actual JDBC Connection default not known yet).
* <p>If not specified, the default gets determined by checking a target
* Connection on startup. If that check fails, the default will be determined
* lazily on first access of a Connection.
* @see java.sql.Connection#setAutoCommit
*/
public void setDefaultAutoCommit(boolean defaultAutoCommit) {
this.defaultAutoCommit = new Boolean(defaultAutoCommit);
}
/**
* Set the default transaction isolation level to expose when no target Connection
* has been fetched yet (-> actual JDBC Connection default not known yet).
* <p>This property accepts the int constant value (e.g. 8) as defined in the
* {@link java.sql.Connection} interface; it is mainly intended for programmatic
* use. Consider using the "defaultTransactionIsolationName" property for setting
* the value by name (e.g. "TRANSACTION_SERIALIZABLE").
* <p>If not specified, the default gets determined by checking a target
* Connection on startup. If that check fails, the default will be determined
* lazily on first access of a Connection.
* @see #setDefaultTransactionIsolationName
* @see java.sql.Connection#setTransactionIsolation
*/
public void setDefaultTransactionIsolation(int defaultTransactionIsolation) {
this.defaultTransactionIsolation = new Integer(defaultTransactionIsolation);
}
/**
* Set the default transaction isolation level by the name of the corresponding
* constant in {@link java.sql.Connection}, e.g. "TRANSACTION_SERIALIZABLE".
* @param constantName name of the constant
* @see #setDefaultTransactionIsolation
* @see java.sql.Connection#TRANSACTION_READ_UNCOMMITTED
* @see java.sql.Connection#TRANSACTION_READ_COMMITTED
* @see java.sql.Connection#TRANSACTION_REPEATABLE_READ
* @see java.sql.Connection#TRANSACTION_SERIALIZABLE
*/
public void setDefaultTransactionIsolationName(String constantName) {
setDefaultTransactionIsolation(constants.asNumber(constantName).intValue());
}
public void afterPropertiesSet() {
super.afterPropertiesSet();
// Determine default auto-commit and transaction isolation
// via a Connection from the target DataSource, if possible.
if (this.defaultAutoCommit == null || this.defaultTransactionIsolation == null) {
try {
Connection con = getTargetDataSource().getConnection();
try {
checkDefaultConnectionProperties(con);
}
finally {
con.close();
}
}
catch (SQLException ex) {
logger.warn("Could not retrieve default auto-commit and transaction isolation settings", ex);
}
}
}
/**
* Check the default connection properties (auto-commit, transaction isolation),
* keeping them to be able to expose them correctly without fetching an actual
* JDBC Connection from the target DataSource.
* <p>This will be invoked once on startup, but also for each retrieval of a
* target Connection. If the check failed on startup (because the database was
* down), we'll lazily retrieve those settings.
* @param con the Connection to use for checking
* @throws SQLException if thrown by Connection methods
*/
protected synchronized void checkDefaultConnectionProperties(Connection con) throws SQLException {
if (this.defaultAutoCommit == null) {
this.defaultAutoCommit = new Boolean(con.getAutoCommit());
}
if (this.defaultTransactionIsolation == null) {
this.defaultTransactionIsolation = new Integer(con.getTransactionIsolation());
}
}
/**
* Expose the default auto-commit value.
*/
protected Boolean defaultAutoCommit() {
return this.defaultAutoCommit;
}
/**
* Expose the default transaction isolation value.
*/
protected Integer defaultTransactionIsolation() {
return this.defaultTransactionIsolation;
}
/**
* Return a Connection handle that lazily fetches an actual JDBC Connection
* when asked for a Statement (or PreparedStatement or CallableStatement).
* <p>The returned Connection handle implements the ConnectionProxy interface,
* allowing to retrieve the underlying target Connection.
* @return a lazy Connection handle
* @see ConnectionProxy#getTargetConnection()
*/
public Connection getConnection() throws SQLException {
return (Connection) Proxy.newProxyInstance(
ConnectionProxy.class.getClassLoader(),
new Class[] {ConnectionProxy.class},
new LazyConnectionInvocationHandler());
}
/**
* Return a Connection handle that lazily fetches an actual JDBC Connection
* when asked for a Statement (or PreparedStatement or CallableStatement).
* <p>The returned Connection handle implements the ConnectionProxy interface,
* allowing to retrieve the underlying target Connection.
* @param username the per-Connection username
* @param password the per-Connection password
* @return a lazy Connection handle
* @see ConnectionProxy#getTargetConnection()
*/
public Connection getConnection(String username, String password) throws SQLException {
return (Connection) Proxy.newProxyInstance(
ConnectionProxy.class.getClassLoader(),
new Class[] {ConnectionProxy.class},
new LazyConnectionInvocationHandler(username, password));
}
/**
* Invocation handler that defers fetching an actual JDBC Connection
* until first creation of a Statement.
*/
private class LazyConnectionInvocationHandler implements InvocationHandler {
private String username;
private String password;
private Boolean readOnly = Boolean.FALSE;
private Integer transactionIsolation;
private Boolean autoCommit;
private boolean closed = false;
private Connection target;
public LazyConnectionInvocationHandler() {
this.autoCommit = defaultAutoCommit();
this.transactionIsolation = defaultTransactionIsolation();
}
public LazyConnectionInvocationHandler(String username, String password) {
this();
this.username = username;
this.password = password;
}
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
// Invocation on ConnectionProxy interface coming in...
if (method.getName().equals("equals")) {
// We must avoid fetching a target Connection for "equals".
// Only consider equal when proxies are identical.
return (proxy == args[0] ? Boolean.TRUE : Boolean.FALSE);
}
else if (method.getName().equals("hashCode")) {
// We must avoid fetching a target Connection for "hashCode",
// and we must return the same hash code even when the target
// Connection has been fetched: use hashCode of Connection proxy.
return new Integer(System.identityHashCode(proxy));
}
else if (method.getName().equals("getTargetConnection")) {
// Handle getTargetConnection method: return underlying connection.
return getTargetConnection(method);
}
if (!hasTargetConnection()) {
// No physical target Connection kept yet ->
// resolve transaction demarcation methods without fetching
// a physical JDBC Connection until absolutely necessary.
if (method.getName().equals("toString")) {
return "Lazy Connection proxy for target DataSource [" + getTargetDataSource() + "]";
}
else if (method.getName().equals("isReadOnly")) {
return this.readOnly;
}
else if (method.getName().equals("setReadOnly")) {
this.readOnly = (Boolean) args[0];
return null;
}
else if (method.getName().equals("getTransactionIsolation")) {
if (this.transactionIsolation != null) {
return this.transactionIsolation;
}
// Else fetch actual Connection and check there,
// because we didn't have a default specified.
}
else if (method.getName().equals("setTransactionIsolation")) {
this.transactionIsolation = (Integer) args[0];
return null;
}
else if (method.getName().equals("getAutoCommit")) {
if (this.autoCommit != null) {
return this.autoCommit;
}
// Else fetch actual Connection and check there,
// because we didn't have a default specified.
}
else if (method.getName().equals("setAutoCommit")) {
this.autoCommit = (Boolean) args[0];
return null;
}
else if (method.getName().equals("commit")) {
// Ignore: no statements created yet.
return null;
}
else if (method.getName().equals("rollback")) {
// Ignore: no statements created yet.
return null;
}
else if (method.getName().equals("getWarnings")) {
return null;
}
else if (method.getName().equals("clearWarnings")) {
return null;
}
else if (method.getName().equals("isClosed")) {
return (this.closed ? Boolean.TRUE : Boolean.FALSE);
}
else if (method.getName().equals("close")) {
// Ignore: no target connection yet.
this.closed = true;
return null;
}
else if (this.closed) {
// Connection proxy closed, without ever having fetched a
// physical JDBC Connection: throw corresponding SQLException.
throw new SQLException("Illegal operation: connection is closed");
}
}
// Target Connection already fetched,
// or target Connection necessary for current operation ->
// invoke method on target connection.
try {
return method.invoke(getTargetConnection(method), args);
}
catch (InvocationTargetException ex) {
throw ex.getTargetException();
}
}
/**
* Return whether the proxy currently holds a target Connection.
*/
private boolean hasTargetConnection() {
return (this.target != null);
}
/**
* Return the target Connection, fetching it and initializing it if necessary.
*/
private Connection getTargetConnection(Method operation) throws SQLException {
if (this.target == null) {
// No target Connection held -> fetch one.
if (logger.isDebugEnabled()) {
logger.debug("Connecting to database for operation '" + operation.getName() + "'");
}
// Fetch physical Connection from DataSource.
this.target = (this.username != null) ?
getTargetDataSource().getConnection(this.username, this.password) :
getTargetDataSource().getConnection();
// If we still lack default connection properties, check them now.
checkDefaultConnectionProperties(this.target);
// Apply kept transaction settings, if any.
if (this.readOnly.booleanValue()) {
this.target.setReadOnly(this.readOnly.booleanValue());
}
if (this.transactionIsolation != null &&
!this.transactionIsolation.equals(defaultTransactionIsolation())) {
this.target.setTransactionIsolation(this.transactionIsolation.intValue());
}
if (this.autoCommit != null && this.autoCommit.booleanValue() != this.target.getAutoCommit()) {
this.target.setAutoCommit(this.autoCommit.booleanValue());
}
}
else {
// Target Connection already held -> return it.
if (logger.isDebugEnabled()) {
logger.debug("Using existing database connection for operation '" + operation.getName() + "'");
}
}
return this.target;
}
}
}
The table below shows all metrics for LazyConnectionDataSourceProxy.java.
| Metric | Value | Description | |
|---|---|---|---|
| BLOCKS | 52.00 | Number of blocks | |
| BLOCK_COMMENT | 15.00 | Number of block comment lines | |
| COMMENTS | 178.00 | Comment lines | |
| COMMENT_DENSITY | 1.29 | Comment density | |
| COMPARISONS | 39.00 | Number of comparison operators | |
| CYCLOMATIC | 53.00 | Cyclomatic complexity | |
| DECL_COMMENTS | 16.00 | Comments in declarations | |
| DOC_COMMENT | 134.00 | Number of javadoc comment lines | |
| ELOC | 138.00 | Effective lines of code | |
| EXEC_COMMENTS | 18.00 | Comments in executable code | |
| EXITS | 33.00 | Procedure exits | |
| FUNCTIONS | 16.00 | Number of function declarations | |
| HALSTEAD_DIFFICULTY | 63.73 | Halstead difficulty | |
| HALSTEAD_EFFORT | 0.00 | Halstead effort | |
| INTERFACE_COMPLEXITY | 64.00 | Interface complexity | |
| JAVA0001 | 0.00 | JAVA0001 Package name does not contain only lower case letters | |
| JAVA0002 | 0.00 | JAVA0002 Package name does not begin with a top level domain name or country code | |
| JAVA0003 | 0.00 | JAVA0003 Minimize use of on-demand (.*) imports | |
| JAVA0004 | 0.00 | JAVA0004 Unnecessary import from java.lang | |
| JAVA0005 | 0.00 | JAVA0005 Imports not in specified order | |
| JAVA0006 | 0.00 | JAVA0006 Empty finally block | |
| JAVA0007 | 0.00 | JAVA0007 Should not declare public field | |
| JAVA0008 | 0.00 | JAVA0008 Empty catch block | |
| JAVA0009 | 0.00 | JAVA0009 Protected member in final class | |
| JAVA0010 | 0.00 | JAVA0010 Non-instantiable class does not contain a non-private static member | |
| JAVA0011 | 0.00 | JAVA0011 Abstract class does not contain an abstract method | |
| JAVA0012 | 0.00 | JAVA0012 Non-constructor method with same name as declaring class | |
| JAVA0013 | 0.00 | JAVA0013 Non-blank final field is not static | |
| JAVA0014 | 0.00 | JAVA0014 Class with only static members has non-private constructor | |
| JAVA0015 | 0.00 | JAVA0015 Package class contains public nested type | |
| JAVA0016 | 0.00 | JAVA0016 Abstract class contains public constructor | |
| JAVA0017 | 0.00 | JAVA0017 Class name does not have required form | |
| JAVA0018 | 0.00 | JAVA0018 Method name does not have required form | |
| JAVA0019 | 0.00 | JAVA0019 Interface name does not have required form | |
| JAVA0020 | 0.00 | JAVA0020 Field name does not have required form | |
| JAVA0021 | 0.00 | JAVA0021 Interface method name does not have required form | |
| JAVA0022 | 0.00 | JAVA0022 Static final field name does not have required form | |
| JAVA0023 | 0.00 | JAVA0023 Empty finalize method | |
| JAVA0024 | 0.00 | JAVA0024 Empty class | |
| JAVA0025 | 0.00 | JAVA0025 Method override is empty | |
| JAVA0026 | 0.00 | JAVA0026 Finalize method with parameters | |
| JAVA0029 | 0.00 | JAVA0029 Private method not used | |
| JAVA0030 | 0.00 | JAVA0030 Private field not used | |
| JAVA0031 | 0.00 | JAVA0031 Case statement not properly closed | |
| JAVA0032 | 0.00 | JAVA0032 Switch statement missing default | |
| JAVA0033 | 0.00 | JAVA0033 default: not last case in switch statement | |
| JAVA0034 | 0.00 | JAVA0034 Missing braces in if statement | |
| JAVA0035 | 0.00 | JAVA0035 Missing braces in for statement | |
| JAVA0036 | 0.00 | JAVA0036 Missing braces in while statement | |
| JAVA0038 | 0.00 | JAVA0038 Non-case label in switch statement | |
| JAVA0039 | 0.00 | JAVA0039 Break statement with label | |
| JAVA0040 | 0.00 | JAVA0040 Switch statement contains N cases (maximum: M) | |
| JAVA0041 | 0.00 | JAVA0041 Nested synchronized block | |
| JAVA0042 | 0.00 | JAVA0042 Empty synchronized statement | |
| JAVA0043 | 0.00 | JAVA0043 Inner class does not use outer class | |
| JAVA0044 | 0.00 | JAVA0044 Serializable class with no instance variables | |
| JAVA0045 | 0.00 | JAVA0045 Serializable class with only transient fields | |
| JAVA0046 | 0.00 | JAVA0046 Name of class not derived from Exception ends with 'Exception' | |
| JAVA0047 | 0.00 | JAVA0047 Serializable class derives from invalid base class | |
| JAVA0048 | 0.00 | JAVA0048 Name of class derived from Exception does not end with 'Exception' | |
| JAVA0049 | 0.00 | JAVA0049 Nested block at depth N (maximum: M) | |
| JAVA0050 | 0.00 | JAVA0050 Class derives from java.lang.Error | |
| JAVA0051 | 0.00 | JAVA0051 Class derives from java.lang.RuntimeException | |
| JAVA0052 | 0.00 | JAVA0052 Class derives from java.lang.Throwable | |
| JAVA0053 | 0.00 | JAVA0053 Unused label | |
| JAVA0054 | 0.00 | JAVA0054 Inheritance depth N exceeds maximum M | |
| JAVA0055 | 0.00 | JAVA0055 Class should be interface | |
| JAVA0056 | 0.00 | JAVA0056 Unnecessary abstract modifier for interface or annotation | |
| JAVA0057 | 0.00 | JAVA0057 Unnecessary default constructor | |
| JAVA0058 | 0.00 | JAVA0058 Constructor calls super() | |
| JAVA0059 | 0.00 | JAVA0059 Method override only calls super() | |
| JAVA0061 | 0.00 | JAVA0061 Inaccessible member in anonymous class | |
| JAVA0062 | 0.00 | JAVA0062 Public class missing public member or protected constructor | |
| JAVA0063 | 0.00 | JAVA0063 Identifier name should not contain '$' | |
| JAVA0064 | 0.00 | JAVA0064 N variations of identifier name (maximum: M) | |
| JAVA0065 | 0.00 | JAVA0065 Unnecessary final modifier for method in final class | |
| JAVA0066 | 0.00 | JAVA0066 Unnecessary modifier for interface nested type | |
| JAVA0067 | 0.00 | JAVA0067 Array descriptor on identifier name | |
| JAVA0068 | 0.00 | JAVA0068 Modifiers not declared in recommended order | |
| JAVA0071 | 0.00 | JAVA0071 Strings compared with == | |
| JAVA0073 | 0.00 | JAVA0073 Integer division in floating-point context | |
| JAVA0074 | 0.00 | JAVA0074 Use of Object.notify() | |
| JAVA0075 | 0.00 | JAVA0075 Method parameter hides field | |
| JAVA0076 | 0.00 | JAVA0076 Use of magic number | |
| JAVA0077 | 0.00 | JAVA0077 Private field not used in declaring class | |
| JAVA0078 | 0.00 | JAVA0078 Floating point values compared with == | |
| JAVA0079 | 0.00 | JAVA0079 Use of instance to reference static member | |
| JAVA0080 | 0.00 | JAVA0080 Import declaration not used | |
| JAVA0081 | 0.00 | JAVA0081 Boolean literal in comparison | |
| JAVA0082 | 0.00 | JAVA0082 Unnecessary widening cast | |
| JAVA0083 | 0.00 | JAVA0083 Unnecessary instanceof test | |
| JAVA0084 | 0.00 | JAVA0084 Should use compound assignment operator | |
| JAVA0085 | 0.00 | JAVA0085 Use of sun.* class | |
| JAVA0087 | 0.00 | JAVA0087 Use of Thread.sleep() | |
| JAVA0089 | 0.00 | JAVA0089 Use of restricted package | |
| JAVA0092 | 0.00 | JAVA0092 Use of restricted type | |
| JAVA0093 | 0.00 | JAVA0093 Redundant assignment | |
| JAVA0094 | 0.00 | JAVA0094 Field hides a superclass field | |
| JAVA0095 | 0.00 | JAVA0095 Uninitialized private field | |
| JAVA0096 | 0.00 | JAVA0096 Field in nested class hides outer field | |
| JAVA0098 | 0.00 | JAVA0098 Minimize use of implicit field initializers | |
| JAVA0100 | 0.00 | JAVA0100 Class contains N non-final fields (maximum: M) | |
| JAVA0101 | 0.00 | JAVA0101 Unnecessary modifier for field in interface | |
| JAVA0102 | 0.00 | JAVA0102 Last statement in finalize() not super.finalize() | |
| JAVA0103 | 0.00 | JAVA0103 Explicit call to finalize() | |
| JAVA0104 | 0.00 | JAVA0104 finalize() only calls super.finalize() | |
| JAVA0105 | 0.00 | JAVA0105 Duplicate import declaration | |
| JAVA0106 | 0.00 | JAVA0106 Unnecessary import from current package | |
| JAVA0108 | 3.00 | JAVA0108 Incorrect javadoc: no @param tag for 'parameter' | |
| JAVA0109 | 0.00 | JAVA0109 Incorrect javadoc: no parameter 'parameter' | |
| JAVA0110 | 4.00 | JAVA0110 Incorrect javadoc: no @return tag | |
| JAVA0111 | 0.00 | JAVA0111 Incorrect javadoc: @return tag for void method | |
| JAVA0112 | 0.00 | JAVA0112 Incorrect javadoc: no exception 'exception' in throws | |
| JAVA0113 | 0.00 | JAVA0113 Incorrect javadoc: no @author tag | |
| JAVA0114 | 1.00 | JAVA0114 Incorrect javadoc: no @version tag | |
| JAVA0115 | 3.00 | JAVA0115 Incorrect javadoc: no @throws or @exception tag for 'exception' | |
| JAVA0116 | 0.00 | JAVA0116 Missing javadoc: field 'field' | |
| JAVA0117 | 2.00 | JAVA0117 Missing javadoc: method 'method' | |
| JAVA0118 | 0.00 | JAVA0118 Missing javadoc: type 'type' | |
| JAVA0119 | 0.00 | JAVA0119 Control variable changed within body of for loop | |
| JAVA0123 | 0.00 | JAVA0123 Use all three components of for loop | |
| JAVA0125 | 0.00 | JAVA0125 Continue statement with label | |
| JAVA0126 | 0.00 | JAVA0126 Method declares unchecked exception in throws | |
| JAVA0128 | 2.00 | JAVA0128 Public constructor in non-public class | |
| JAVA0130 | 0.00 | JAVA0130 Non-static method does not use instance fields | |
| JAVA0131 | 0.00 | JAVA0131 Compatible method does not override base | |
| JAVA0132 | 0.00 | JAVA0132 Method overload with compatible signature | |
| JAVA0133 | 0.00 | JAVA0133 Non-synchronized method overrides synchronized method | |
| JAVA0135 | 0.00 | JAVA0135 Only one of Object.equals and Object.hashCode defined: missing 'method' | |
| JAVA0136 | 0.00 | JAVA0136 N methods defined in class (maximum: M) | |
| JAVA0137 | 0.00 | JAVA0137 Non-abstract class missing constructor | |
| JAVA0138 | 0.00 | JAVA0138 N parameters defined for method (maximum: M) | |
| JAVA0139 | 0.00 | JAVA0139 Definition of main other than public static void main(java.lang.String[]) | |
| JAVA0141 | 0.00 | JAVA0141 Unnecessary modifier for method in interface | |
| JAVA0143 | 1.00 | JAVA0143 Synchronized method | |
| JAVA0144 | 0.00 | JAVA0144 Line exceeds maximum M characters | |
| JAVA0145 | 781.00 | JAVA0145 Tab character used in source file | |
| JAVA0150 | 0.00 | JAVA0150 java.lang.Error (or subclass) thrown | |
| JAVA0153 | 0.00 | JAVA0153 Inefficient conversion of integer to string | |
| JAVA0159 | 0.00 | JAVA0159 Inefficient conversion of string to integer | |
| JAVA0160 | 0.00 | JAVA0160 Method does not throw specified exception | |
| JAVA0161 | 0.00 | JAVA0161 Conditional wait() not in loop | |
| JAVA0163 | 0.00 | JAVA0163 Empty statement | |
| JAVA0165 | 0.00 | JAVA0165 Conflicting return statement in finally block | |
| JAVA0166 | 0.00 | JAVA0166 Generic exception caught | |
| JAVA0167 | 0.00 | JAVA0167 ThreadDeath not rethrown | |
| JAVA0169 | 0.00 | JAVA0169 Unnecessary catch block: exception 'exception' | |
| JAVA0170 | 0.00 | JAVA0170 Caught exception not derived from java.lang.Exception | |
| JAVA0171 | 0.00 | JAVA0171 Unused local variable | |
| JAVA0173 | 0.00 | JAVA0173 Unused method parameter | |
| JAVA0174 | 0.00 | JAVA0174 Assigned local variable never used | |
| JAVA0175 | 0.00 | JAVA0175 Successive assignment to variable | |
| JAVA0176 | 0.00 | JAVA0176 Local variable name does not have required form | |
| JAVA0177 | 0.00 | JAVA0177 Variable declaration missing initializer | |
| JAVA0179 | 0.00 | JAVA0179 Local variable hides visible field | |
| JAVA0233 | 0.00 | JAVA0233 Definition of serialVersionUID other than 'private static final long serialVersionUID' | |
| JAVA0234 | 0.00 | JAVA0234 Class is Serializable but does not define serialVersionUID | |
| JAVA0235 | 0.00 | JAVA0235 Class defines serialVersionUID but does not implement Serializable | |
| JAVA0236 | 0.00 | JAVA0236 Attempt to clone an object which does not implement Cloneable | |
| JAVA0237 | 0.00 | JAVA0237 Class implements Cloneable but does not have public clone method | |
| JAVA0238 | 0.00 | JAVA0238 Clone method does not call super.clone() | |
| JAVA0239 | 0.00 | JAVA0239 Class declares 'readObject' or 'writeObject' but does not implement Serializable | |
| JAVA0240 | 0.00 | JAVA0240 Serializable class which declares readObject or writeObject but not both | |
| JAVA0241 | 0.00 | JAVA0241 'readObject' or 'writeObject' should be declared private in Serializable class | |
| JAVA0242 | 0.00 | JAVA0242 Transient field in non-Serializable class | |
| JAVA0243 | 0.00 | JAVA0243 'readResolve' or 'writeReplace' should be declared private or protected | |
| JAVA0244 | 0.00 | JAVA0244 Field or method name in subclass differs only by case from inherited field or method | |
| JAVA0245 | 0.00 | JAVA0245 JUnit TestCase with non-trivial constructor | |
| JAVA0246 | 0.00 | JAVA0246 JUnit assertXXX statement missing message parameter | |
| JAVA0247 | 0.00 | JAVA0247 JUnit 'setUp()' and 'tearDown()' should call super method | |
| JAVA0248 | 0.00 | JAVA0248 JUnit method 'setUp' or 'tearDown' with incorrect signature | |
| JAVA0249 | 0.00 | JAVA0249 JUnit TestCase 'suite()' should be declared static | |
| JAVA0250 | 0.00 | JAVA0250 JUnit TestCase declares testXXX method with incorrect signature | |
| JAVA0251 | 0.00 | JAVA0251 Use '%n' for line breaks in printf/format for platform independence | |
| JAVA0252 | 0.00 | JAVA0252 'enum' is a Java 1.5 reserved word | |
| JAVA0253 | 0.00 | JAVA0253 Not all enum constants consumed in switch statement | |
| JAVA0254 | 0.00 | JAVA0254 Use enhanced for loop construct instead of Iterator | |
| JAVA0255 | 0.00 | JAVA0255 Result of method invocation not used | |
| JAVA0256 | 0.00 | JAVA0256 Assignment of external collection/array to field | |
| JAVA0257 | 0.00 | JAVA0257 Use of 'Constant Interface' anti-pattern | |
| JAVA0258 | 0.00 | JAVA0258 Implement Iterable for foreach compatibility | |
| JAVA0259 | 0.00 | JAVA0259 Return of collection/array field | |
| JAVA0260 | 0.00 | JAVA0260 Use 'enum' instead of Enumerated Type pattern | |
| JAVA0261 | 0.00 | JAVA0261 Use specialized Enum collection types | |
| JAVA0262 | 0.00 | JAVA0262 Use of char in integer context | |
| JAVA0263 | 0.00 | JAVA0263 Long literal ends with 'l' instead of 'L' | |
| JAVA0264 | 0.00 | JAVA0264 Integer math in long context - check for overflow | |
| JAVA0265 | 0.00 | JAVA0265 Use of Throwable.printStackTrace() | |
| JAVA0266 | 0.00 | JAVA0266 Use of System.out | |
| JAVA0267 | 0.00 | JAVA0267 Use of System.err | |
| JAVA0269 | 0.00 | JAVA0269 Contents of StringBuffer never used | |
| JAVA0270 | 0.00 | JAVA0270 Use Java 5.0 enhanced for loop construct to iterate over all elements in an array | |
| JAVA0271 | 0.00 | JAVA0271 Minimize use of on-demand (.*) static imports | |
| JAVA0272 | 0.00 | JAVA0272 Thread.run() called | |
| JAVA0273 | 0.00 | JAVA0273 Non-final derivative of Thread calls start() in constructor | |
| JAVA0274 | 0.00 | JAVA0274 Serializable class has a synchronized readObject() | |
| JAVA0275 | 0.00 | JAVA0275 Serializable class has a synchronized writeObject() and no other synchronized methods | |
| JAVA0276 | 0.00 | JAVA0276 Unnecessary use of String constructor | |
| JAVA0277 | 0.00 | JAVA0277 Iterator.next() implementation does not throw NoSuchElementException | |
| JAVA0278 | 2.00 | JAVA0278 Unnecessary use of Boolean constructor | |
| JAVA0279 | 0.00 | JAVA0279 Serialization method readObject or readObjectNoData calls an overridable method | |
| JAVA0280 | 0.00 | JAVA0280 IllegalMonitorStateException caught | |
| JAVA0281 | 0.00 | JAVA0281 Iterator.next() not called in loop | |
| JAVA0282 | 0.00 | JAVA0282 Call to Iterator.next() in loop which does not test Iterator.hasNext() | |
| JAVA0283 | 0.00 | JAVA0283 Control variable not updated in loop body | |
| JAVA0284 | 0.00 | JAVA0284 Explicit garbage collection | |
| JAVA0285 | 0.00 | JAVA0285 Dereference of potentially null variable | |
| JAVA0286 | 0.00 | JAVA0286 Dereference of null variable | |
| JAVA0287 | 0.00 | JAVA0287 Unnecessary null check | |
| JAVA0288 | 0.00 | JAVA0288 Inconsistent null check | |
| LINES | 420.00 | Number of lines in the source file | |
| LINE_COMMENT | 29.00 | Number of line comments | |
| LOC | 192.00 | Lines of code | |
| LOGICAL_LINES | 75.00 | Number of statements | |
| LOOPS | 0.00 | Number of loops | |
| NEST_DEPTH | 4.00 | Maximum nesting depth | |
| OPERANDS | 363.00 | Number of operands | |
| OPERATORS | 933.00 | Number of operators | |
| PARAMS | 13.00 | Number of formal parameter declarations | |
| PROGRAM_LENGTH | 1296.00 | Halstead program length | |
| PROGRAM_VOCAB | 177.00 | Halstead program vocabulary | |
| PROGRAM_VOLUME | 0.00 | Halstead program volume | |
| RETURNS | 51.00 | Number of return points from functions | |
| SIZE | 15651.00 | Size of the file in bytes | |
| UNIQUE_OPERANDS | 131.00 | Number of unique operands | |
| UNIQUE_OPERATORS | 46.00 | Number of unique operators | |
| WHITESPACE | 50.00 | Number of whitespace lines | |