Connection error with WAS 5.1 and DB2 z/OS 8.2

[Abhijit Sarkar]

I am getting a strange error while performing load test on my application.
From the logs, it seems at some point DB2 is refusing to give away any more connections to WebSphere.
Would you be kind enough to provide some insight in this issue? Snippets of the log is posted below.

[5/21/10 10:37:29:784 EDT] 4721a4cc ConnectionMan E J2CA0020E: The Connection Pool Manager could not allocate a Managed Connection: javax.resource.spi.ResourceAllocationException: DSRA8100E: Unable to get a XAConnection from the DataSource.
	at com.ibm.ejs.j2c.poolmanager.FreePool.createManagedConnectionWithMCWrapper(FreePool.java(Compiled Code))
	at com.ibm.ejs.j2c.poolmanager.FreePool.createOrWaitForConnection(FreePool.java(Compiled Code))
	at com.ibm.ejs.j2c.poolmanager.PoolManager.reserve(PoolManager.java(Compiled Code))
	at com.ibm.ejs.j2c.ConnectionManager.allocateMCWrapper(ConnectionManager.java(Compiled Code))
	at com.ibm.ejs.j2c.ConnectionManager.allocateConnection(ConnectionManager.java(Compiled Code))
	at com.ibm.ws.rsadapter.jdbc.WSJdbcDataSource.getConnection(WSJdbcDataSource.java(Compiled Code))
	at com.ibm.ws.rsadapter.jdbc.WSJdbcDataSource.getConnection(WSJdbcDataSource.java(Compiled Code))	
---- Begin backtrace for Nested Throwables
com.ibm.ws.exception.WsException: DSRA8100E: Unable to get a XAConnection from the DataSource. with SQL State : 40003 SQL Code : -1224
	at sun.reflect.GeneratedConstructorAccessor26.newInstance(Unknown Source)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java(Compiled Code))
	at java.lang.reflect.Constructor.newInstance(Constructor.java(Compiled Code))
	at com.ibm.websphere.rsadapter.GenericDataStoreHelper.mapExceptionHelper(GenericDataStoreHelper.java(Compiled Code))
	at com.ibm.websphere.rsadapter.GenericDataStoreHelper.mapException(GenericDataStoreHelper.java(Compiled Code))
	at com.ibm.ws.rsadapter.spi.WSRdbDataSource.getPooledConnection(WSRdbDataSource.java(Compiled Code))
	at com.ibm.ws.rsadapter.spi.WSManagedConnectionFactoryImpl.createManagedConnection(WSManagedConnectionFactoryImpl.java(Compiled Code))
	at com.ibm.ejs.j2c.poolmanager.FreePool.createManagedConnectionWithMCWrapper(FreePool.java(Compiled Code))
	at com.ibm.ejs.j2c.poolmanager.FreePool.createOrWaitForConnection(FreePool.java(Compiled Code))
	at com.ibm.ejs.j2c.poolmanager.PoolManager.reserve(PoolManager.java(Compiled Code))
	at com.ibm.ejs.j2c.ConnectionManager.allocateMCWrapper(ConnectionManager.java(Compiled Code))
	at com.ibm.ejs.j2c.ConnectionManager.allocateConnection(ConnectionManager.java(Compiled Code))
	at com.ibm.ws.rsadapter.jdbc.WSJdbcDataSource.getConnection(WSJdbcDataSource.java(Compiled Code))
	at com.ibm.ws.rsadapter.jdbc.WSJdbcDataSource.getConnection(WSJdbcDataSource.java(Compiled Code))	
Caused by: java.sql.SQLException: [IBM][CLI Driver] SQL1224N  A database agent could not be started to service a request, or was terminated as a result of a database system shutdown or a force command.  SQLSTATE=55032
DSRA0010E: SQL State = 40003, Error Code = -1,224DSRA0010E: SQL State = 40003, Error Code = -1,224
	... 46 more
---- Begin backtrace for nested exception
java.sql.SQLException: [IBM][CLI Driver] SQL1224N  A database agent could not be started to service a request, or was terminated as a result of a database system shutdown or a force command.  SQLSTATE=55032
DSRA0010E: SQL State = 40003, Error Code = -1,224DSRA0010E: SQL State = 40003, Error Code = -1,224
	at sun.reflect.GeneratedConstructorAccessor26.newInstance(Unknown Source)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java(Compiled Code))
	at java.lang.reflect.Constructor.newInstance(Constructor.java(Compiled Code))
	at com.ibm.websphere.rsadapter.GenericDataStoreHelper.mapExceptionHelper(GenericDataStoreHelper.java(Compiled Code))
	at com.ibm.websphere.rsadapter.GenericDataStoreHelper.mapException(GenericDataStoreHelper.java(Compiled Code))
	at com.ibm.ws.rsadapter.spi.WSRdbDataSource.getPooledConnection(WSRdbDataSource.java(Compiled Code))
	at com.ibm.ws.rsadapter.spi.WSManagedConnectionFactoryImpl.createManagedConnection(WSManagedConnectionFactoryImpl.java(Compiled Code))
	at com.ibm.ejs.j2c.poolmanager.FreePool.createManagedConnectionWithMCWrapper(FreePool.java(Compiled Code))
	at com.ibm.ejs.j2c.poolmanager.FreePool.createOrWaitForConnection(FreePool.java(Compiled Code))
	at com.ibm.ejs.j2c.poolmanager.PoolManager.reserve(PoolManager.java(Compiled Code))
	at com.ibm.ejs.j2c.ConnectionManager.allocateMCWrapper(ConnectionManager.java(Compiled Code))
	at com.ibm.ejs.j2c.ConnectionManager.allocateConnection(ConnectionManager.java(Compiled Code))
	at com.ibm.ws.rsadapter.jdbc.WSJdbcDataSource.getConnection(WSJdbcDataSource.java(Compiled Code))
	at com.ibm.ws.rsadapter.jdbc.WSJdbcDataSource.getConnection(WSJdbcDataSource.java(Compiled Code))