I am new to Multi-threading in JAVA and am facing a problem. I am getting an exception which says that
java.lang.InterruptedException: sleep interrupted
this follows a loss to connection to db. I am clueless regarding what is going wrong there. It looks like after thread is interrupted, they are being re-initialized but are not getting started..
following is my run method
public void run() {
LOG.info("Started");
running = true;
while (running) {
Lock readLock = readWriteLock.readLock();
readLock.lock();
long loopDelay;
try {
loopDelay = executor.execute();
if (loopDelay > 0) {
Thread.sleep(loopDelay);
}
} catch (Exception e) {
LOG.info("Executor Interrupted", e);
break;
} finally {
readLock.unlock();
}
}
LOG.info("Stopped");
}
possible solution: after going through the link suggested by david I feel the problem here is the same mentioned by David i.e “A thread cannot process an interrupt while it’s sleeping.” so to fix this I should handle the Interrrupted Exception in a better way i.e as suggesteb by david.
Following is my stack trace.. Can Some one please help me in understanding the issue
2012-02-03 10:38:09,260 150696427 [taskDiscoveryCallExecutorThread] INFO (TaskExecutorThread.java:89) - Executor Interrupted
java.lang.InterruptedException: sleep interrupted
at java.lang.Thread.sleep(Native Method)
at com.xyz.abc.backgroundtask.impl.TaskExecutorThread.run(TaskExecutorThread.java:86)
2012-02-03 10:38:09,261 150696428 [taskDiscoveryCallExecutorThread] INFO (TaskExecutorThread.java:95) - Stopped
2012-02-03 10:38:09,261 150696428 [main] INFO (TaskExecutorThread.java:69) - shutdown
2012-02-03 10:38:09,262 150696429 [taskRuleExecutorThread] ERROR (JDBCExceptionReporter.java:101) - Cannot get a connection, general error
2012-02-03 10:38:09,262 150696429 [taskRuleExecutorThread] ERROR (JDBCExceptionReporter.java:101) - Cannot get a connection, general error
2012-02-03 10:38:09,294 150696461 [taskRuleExecutorThread] DEBUG (EventScope.java:107) - Destroy scope for customer c02c5ac7-8dee-42aa-b344-ff7f7f6894f5
2012-02-03 10:38:09,294 150696461 [taskRuleExecutorThread] ERROR (TaskExecutor.java:205) - Catch exception
org.springframework.jdbc.UncategorizedSQLException: Hibernate operation: Cannot open connection; uncategorized SQLException for SQL [???]; SQL state [null]; error code [0]; Cannot get a connection, general error; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot get a connection, general error
at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:83)
at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:80)
at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:80)
at org.springframework.orm.hibernate3.HibernateAccessor.convertJdbcAccessException(HibernateAccessor.java:424)
at org.springframework.orm.hibernate3.HibernateAccessor.convertHibernateAccessException(HibernateAccessor.java:410)
at org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:411)
at org.springframework.orm.hibernate3.HibernateTemplate.executeWithNativeSession(HibernateTemplate.java:374)
at org.springframework.orm.hibernate3.HibernateTemplate.findByCriteria(HibernateTemplate.java:1046)
at org.springframework.orm.hibernate3.HibernateTemplate.findByCriteria(HibernateTemplate.java:1039)
at com.xyz.abc.web.dao.RuleDao.loadActive(RuleDao.java:53)
at com.xyz.abc.web.service.RuleServiceImpl.createRulesByTemplate(RuleServiceImpl.java:39)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
at $Proxy60.createRulesByTemplate(Unknown Source)
at com.xyz.abc.rules.RulesInvoker.checkIsInitialized(RulesInvoker.java:97)
at com.xyz.abc.rules.RulesInvoker.invokeForEvent(RulesInvoker.java:73)
at com.xyz.abc.mdp.RabbitMqMessageProcessor.processMessage(RabbitMqMessageProcessor.java:53)
at sun.reflect.GeneratedMethodAccessor101.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:186)
at com.xyz.abc.backgroundtask.impl.TaskExecutor.invokeMethod(TaskExecutor.java:156)
at com.xyz.abc.backgroundtask.impl.TaskExecutor.invokeBean(TaskExecutor.java:139)
at com.xyz.abc.backgroundtask.impl.TaskExecutor.doExecute(TaskExecutor.java:116)
at com.xyz.abc.backgroundtask.impl.TaskExecutor.executeTask(TaskExecutor.java:104)
at com.xyz.abc.backgroundtask.impl.TaskExecutor.access$200(TaskExecutor.java:39)
at com.xyz.abc.backgroundtask.impl.TaskExecutor$1.doInTransaction(TaskExecutor.java:85)
at com.xyz.abc.backgroundtask.impl.TaskExecutor$1.doInTransaction(TaskExecutor.java:79)
at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:130)
at com.xyz.abc.backgroundtask.impl.TaskExecutor.execute(TaskExecutor.java:79)
at com.xyz.abc.backgroundtask.impl.TaskExecutorThread.run(TaskExecutorThread.java:84)
Caused by: org.apache.commons.dbcp.SQLNestedException: Cannot get a connection, general error
at org.apache.commons.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:118)
at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:1044)
at org.springframework.orm.hibernate3.LocalDataSourceConnectionProvider.getConnection(LocalDataSourceConnectionProvider.java:81)
at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:446)
at org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:167)
at org.hibernate.jdbc.AbstractBatcher.prepareQueryStatement(AbstractBatcher.java:161)
at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1596)
at org.hibernate.loader.Loader.doQuery(Loader.java:717)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:270)
at org.hibernate.loader.Loader.doList(Loader.java:2294)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2172)
at org.hibernate.loader.Loader.list(Loader.java:2167)
at org.hibernate.loader.criteria.CriteriaLoader.list(CriteriaLoader.java:119)
at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1706)
at org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:347)
at org.springframework.orm.hibernate3.HibernateTemplate$36.doInHibernate(HibernateTemplate.java:1056)
at org.springframework.orm.hibernate3.HibernateTemplate$36.doInHibernate(HibernateTemplate.java:1)
at org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:406)
... 33 more
Caused by: java.lang.InterruptedException
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Object.java:485)
at org.apache.commons.pool.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:1104)
at org.apache.commons.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:106)
... 50 more
2012-02-03 10:38:09,399 150696566 [taskRuleExecutorThread] INFO (TaskExecutor.java:93) - org.springframework.transaction.UnexpectedRollbackException: Transaction rolled back because it has been marked as rollback-only
2012-02-03 10:38:09,399 150696566 [taskRuleExecutorThread] INFO (TaskExecutorThread.java:89) - Executor Interrupted
java.lang.InterruptedException: sleep interrupted
at java.lang.Thread.sleep(Native Method)
at com.xyz.abc.backgroundtask.impl.TaskExecutorThread.run(TaskExecutorThread.java:86)
2012-02-03 10:38:09,399 150696566 [taskRuleExecutorThread] INFO (TaskExecutorThread.java:95) - Stopped
2012-02-03 10:38:09,400 150696567 [main] INFO (TaskExecutorThread.java:69) - shutdown
2012-02-03 10:38:09,400 150696567 [taskParatureExecutorThread] INFO (TaskExecutorThread.java:89) - Executor Interrupted
java.lang.InterruptedException: sleep interrupted
at java.lang.Thread.sleep(Native Method)
at com.xyz.abc.backgroundtask.impl.TaskExecutorThread.run(TaskExecutorThread.java:86)
2012-02-03 10:38:09,400 150696567 [taskParatureExecutorThread] INFO
(TaskExecutorThread.java:95) - Stopped
2012-02-03 10:38:09,400 150696567 [main] INFO (TaskExecutorThread.java:69) - shutdown
A thread cannot process an interrupt while it’s sleeping. So you need to catch the exception when the thread comes out of sleep and then process the interrupt. The method is explained well in this answer. Usually it looks like this: