Hi,

My application is having both JDBC as well as Hibernate connection. May be because of this I'm getting OutOfMemory exception as mentioned below :

Exception in thread "Timer-1" java.lang.OutOfMemoryError: Java heap space
at java.lang.StringCoding$StringDecoder.decode(StringCoding.java:133)
at java.lang.StringCoding.decode(StringCoding.java:173)
at java.lang.String.<init>(String.java:444)
at java.lang.String.<init>(String.java:516)
at com.mysql.jdbc.ResultSet.getStringInternal(ResultSet.java:2246)
at com.mysql.jdbc.ResultSet.getString(ResultSet.java:2203)
at com.mysql.jdbc.Connection.loadServerVariables(Connection.java:3532)
at com.mysql.jdbc.Connection.initializePropsFromServer(Connection.java:3315)
at com.mysql.jdbc.Connection.createNewIO(Connection.java:1789)
at com.mysql.jdbc.Connection.<init>(Connection.java:437)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:268)
at java.sql.DriverManager.getConnection(DriverManager.java:582)
at java.sql.DriverManager.getConnection(DriverManager.java:154)
at org.springframework.jdbc.datasource.DriverManagerDataSource.getConnectionFromDriverManager(DriverManagerDataSource.java:174)
at org.springframework.jdbc.datasource.DriverManagerDataSource.getConnectionFromDriver(DriverManagerDataSource.java:165)
at org.springframework.jdbc.datasource.AbstractDriverBasedDataSource.getConnectionFromDriver(AbstractDriverBasedDataSource.java:149)
at org.springframework.jdbc.datasource.AbstractDriverBasedDataSource.getConnection(AbstractDriverBasedDataSource.java:119)
at org.springframework.orm.hibernate3.LocalDataSourceConnectionProvider.getConnection(LocalDataSourceConnectionProvider.java:82)
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:1573)
at org.hibernate.loader.Loader.doQuery(Loader.java:696)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259)
at org.hibernate.loader.Loader.doList(Loader.java:2228)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2125)
at org.hibernate.loader.Loader.list(Loader.java:2120)
at org.hibernate.loader.criteria.CriteriaLoader.list(CriteriaLoader.java:118)
at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1596)
at org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:306)
at org.springframework.orm.hibernate3.HibernateTemplate$36.doInHibernate(HibernateTemplate.java:1061)
at org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:419)


I just wanted to know whether it is because of the presence of both connection or is it a Hibernate problem?

Thanks in advance

It's likely neither one. It's impossible to say from the stack trace what is causing an OOM exception... that is just the first thing that happened to fail. I would recommend running your app in a profiler. It's more likely something in your application.

sam