Jmeter测试的JDCBC连接错误 [英] JDCBC connection error with Jmeter test
本文介绍了Jmeter测试的JDCBC连接错误的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我尝试使用Jmeter来强调我的应用程序.当我不同步我的两个方法时，我会遇到多个错误，如下所示:
I try to stress my application with Jmeter. When i don't synchronize my two methods I have multiple errors like the following:
该语句已关闭. 或
22:43:40,669 ERROR [stderr] (http-localhost-127.0.0.1-8080-106) java.sql.SQLException: Error
22:43:40,669 ERROR [stderr] (http-localhost-127.0.0.1-8080-106) at org.jboss.jca.adapters.jdbc.WrappedConnection.checkException(WrappedConnection.java:1643)
22:43:40,670 ERROR [stderr] (http-localhost-127.0.0.1-8080-106) at org.jboss.jca.adapters.jdbc.WrappedStatement.checkException(WrappedStatement.java:1262)
22:43:40,670 ERROR [stderr] (http-localhost-127.0.0.1-8080-106) at org.jboss.jca.adapters.jdbc.WrappedResultSet.checkException(WrappedResultSet.java:4063)
22:43:40,670 ERROR [stderr] (http-localhost-127.0.0.1-8080-106) at org.jboss.jca.adapters.jdbc.WrappedResultSet.next(WrappedResultSet.java:1866)
22:43:40,671 ERROR [stderr] (http-localhost-127.0.0.1-8080-106) at fr.formation.dao.DaoImpl.getAllPersonnes(DaoImpl.java:275)
或
java.sql.SQLException: The result set is closed.
或
Caused by: java.lang.NullPointerException
22:43:40,992 ERROR [stderr] (http-localhost-127.0.0.1-8080-73) at com.mysql.jdbc.ResultSetImpl.checkColumnBounds(ResultSetImpl.java:825)
22:43:40,993 ERROR [stderr] (http-localhost-127.0.0.1-8080-73) at com.mysql.jdbc.ResultSetImpl.getInt(ResultSetImpl.java:2710)
22:43:40,993 ERROR [stderr] (http-localhost-127.0.0.1-8080-73) at com.mysql.jdbc.ResultSetImpl.getInt(ResultSetImpl.java:2846)
22:43:40,993 ERROR [stderr] (http-localhost-127.0.0.1-8080-73) at org.jboss.jca.adapters.jdbc.WrappedResultSet.getInt(WrappedResultSet.java:1073)
22:43:40,993 ERROR [stderr] (http-localhost-127.0.0.1-8080-73) ... 23 more
22:43:40,993 ERROR [stderr] (http-localhost-127.0.0.1-8080-184) java.sql.SQLException: The result set is closed.
22:43:40,994 ERROR [stderr] (http-localhost-127.0.0.1-8080-184) at org.jboss.jca.adapters.jdbc.WrappedResultSet.checkState(WrappedResultSet.java:4081)
22:43:40,994 ERROR [stderr] (http-localhost-127.0.0.1-8080-184) at org.jboss.jca.adapters.jdbc.WrappedResultSet.getInt(WrappedResultSet.java:1065)
我的代码:
public List<PersonneDao> getAllPersonnes() throws SQLException{
List<PersonneDao> liste = new ArrayList<PersonneDao>();
ResultSet rs = null ;
PreparedStatement preparedStatement = null;
try {
connection = ConnectionUtil.getInstance().getConnection();
preparedStatement = (PreparedStatement) connection.prepareStatement("select * from personne");
rs = preparedStatement.executeQuery();
while (rs.next()) {
PersonneDao user = new PersonneDao();
user.setId (rs.getInt("id"));
user.setNom (rs.getString("nom"));
user.setPrenom(rs.getString("prenom"));
user.setEmail(rs.getString("email"));
liste.add(user);
}
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}finally{
if (rs != null) {
try {
rs.close();
} catch (SQLException sqlex) {
// ignore, as we can't do anything about it here
}
rs = null;
}
if (preparedStatement != null) {
try {
preparedStatement.close();
} catch (SQLException sqlex) {
// ignore, as we can't do anything about it here
}
preparedStatement = null;
}
if (connection != null) {
try {
ConnectionUtil.getInstance().close(connection);
} catch (SQLException sqlex) {
// ignore, as we can't do anything about it here
}
connection = null;
}
}
return liste;
}
}
和
public class ConnectionUtil {
private DataSource dataSource;
private static ConnectionUtil instance = new ConnectionUtil();
private ConnectionUtil() {
try {
Context initContext = new InitialContext();
dataSource = (DataSource) initContext.lookup("java:/dsFormationJSP");
} catch (NamingException e) {
e.printStackTrace();
}
}
public static ConnectionUtil getInstance() {
return instance;
}
public Connection getConnection() throws SQLException {
Connection connection = dataSource.getConnection();
return connection;
}
public void close(Connection connection) throws SQLException {
if (connection != null && !connection.isClosed()) {
connection.close();
}
connection = null;
}
}
并且我在本次会议上使用Jboss AS 7.1
and i use Jboss AS 7.1 with this conf
<datasource jta="false" jndi-name="java:/dsFormationJSP" pool-name="dsFormationJSP" enabled="true" use-ccm="false">
<connection-url>jdbc:mysql://localhost:3306/base_personne</connection-url>
<driver-class>com.mysql.jdbc.Driver</driver-class>
<driver>mysql-connector-java-5.1.30-bin.jarcom.mysql.jdbc.Driver_5_1</driver>
<pool>
<min-pool-size>50</min-pool-size>
<max-pool-size>70</max-pool-size>
<prefill>true</prefill>
</pool>
<security>
<user-name>root</user-name>
<password>root</password>
</security>
<validation>
<validate-on-match>false</validate-on-match>
<background-validation>false</background-validation>
</validation>
<timeout>
<blocking-timeout-millis>50000</blocking-timeout-millis>
<idle-timeout-minutes>5</idle-timeout-minutes>
</timeout>
<statement>
<share-prepared-statements>false</share-prepared-statements>
</statement>
</datasource>
当我同步两种方法时，就可以了.我通常不需要这样做(它是数据库和jboss的本机机制).谢谢您的帮助.
When i synchronized the two methods it's OK. I normally do not need to to that ( its the native mechanism of database and jboss).Thanks for your help.
推荐答案
getAllPersonnes()中的connection似乎是一个字段，而不是局部变量.这意味着当同时执行一个执行时，可能会覆盖另一个执行的连接，这可能导致使用同一连接的两个执行.
It looks like connection in getAllPersonnes() is a field, and not a local variable. This means that when run concurrently one execution could overwrite the connection of another execution, this can lead to two executions using the same connection.
例如:
- Thread1 设置
connection， - Thread2 设置
connection， - Thread1 准备语句(连接由 Thread2 设置！)，
- Thread2 prepares语句，
- 等
- Thread1 sets
connection, - Thread2 sets
connection, - Thread1 prepares statement (with connection set by Thread2!),
- Thread2 prepares statement,
- etc
哪个方法完成首先关闭连接，然后再完成另一个连接.关闭连接会关闭从属语句和结果集，从而导致错误.
Whichever method finishes first closes the connection before the other is done with it. Closing a connection closes the dependent statement and result set, which leads to the errors.
您需要将connection更改为方法内部的局部变量，以使其不会被其他线程覆盖.
You need to change connection to a local variable inside the method, so it can't be overwritten by other threads.
这篇关于Jmeter测试的JDCBC连接错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
