From time to time, this small application is hung on a DB access operation. After recycling it, I get the following information. Can anyone tell what causes the openConnection suspended and how to prevent it? Since the DB connection is up after a server recycle, I believe the cause is not on the DB side, but the Hibernate.

Thanks a lot.

Hibernate version:
3.3

Full stack trace of any exception that occurs:

root cause

java.lang.ThreadDeath
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1221)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1181)
java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:420)
org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:144)
org.hibernate.jdbc.JDBCContext.connection(JDBCContext.java:119)
org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:57)
org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1326)
org.springframework.orm.hibernate3.HibernateTransactionManager.doBegin(HibernateTransactionManager.java:494)
org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:315)
org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:257)
org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:102)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:209)

Name and version of the database you are using:
PostgreSQL 8.1