getConnection / borrowObject fails with NullPointerException
------------------------------------------------------------
Key: DBCP-225
URL: https://issues.apache.org/jira/browse/DBCP-225
Project: Commons Dbcp
Issue Type: Bug
Affects Versions: 1.2.2, 1.2.1
Environment: Solaris 10, Oracle 10g RAC
Reporter: Alexei Samonov
We use dbcp PoolingDataSource in Solaris/Oracle 10g RAC environment and our
getConnection calls fail sporadically with the following stack trace (1.2.1)
Caused by: org.apache.commons.dbcp.SQLNestedException: Cannot get a connection,
pool exhausted
at
org.apache.commons.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:103)
at
org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:540)
... more
Caused by: java.util.NoSuchElementException: Could not create a validated
object, cause: null
at
org.apache.commons.pool.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:806)
at
org.apache.commons.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:95)
... 24 more
This is definitely not a "pool exhausted" situation, it is just being reported
as pool exhausted. Since NoSuchElementException that you use does not allow
cause, only Exception message (null) is being printed. With some debugging I
was able to recover the root exception:
java.lang.NullPointerException
at
org.apache.commons.dbcp.DelegatingConnection.setAutoCommit(DelegatingConnection.java:268)
at
org.apache.commons.dbcp.PoolableConnectionFactory.activateObject(PoolableConnectionFactory.java:368)
at
org.apache.commons.pool.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:786)
at
org.apache.commons.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:95)
at
org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:540)
...
Looks like it is trying to borrow/validate DelegatingConnection which delegate
is null.
Hoping to resolve the issue we upgraded to 1.2.2 but it did not help. Here is
is an exception stack trace from 1.2.2:
org.apache.commons.dbcp.SQLNestedException: Cannot get a connection, pool error
Could not create a validated object, cause: null
at
org.apache.commons.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:104)
at
org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:880)
... more
Caused by: java.util.NoSuchElementException: Could not create a validated
object, cause: null
at
org.apache.commons.pool.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:871)
at
org.apache.commons.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:96)
... 28 more
We use the following dbcp properties:
autoCommit="false"
readOnly="false"
maxActive="200"
maxIdle="20"
minIdle="10"
minEvictableIdleIime="300000"
maxWait="200"
accessToUnderlyingConnectionAllowed="true"
validationQuery="SELECT 1 FROM DUAL"
I could not find the existing reported dbcp/object pool bug but I see similar
reports on the web, for example
http://forum.java.sun.com/thread.jspa?threadID=713200&messageID=4124915
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