I noticed that occasionally following statement fails:
jbpmContext.getGraphSession
However, calling it again works. For example, I fixed above by
try {
jbpmContext.getGraphSession();
} catch (org.hibernate.exception.JDBCConnectionException e) {
jbpmContext.getGraphSession();
}
I have tried both hsqldb and mysqldb and I see same sporadic erros. Is this
known problem? Here is full stack trace:
org.hibernate.exception.JDBCConnectionException: Cannot open connection at
org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:72) at
org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
at
org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:29)
at
org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:318)
at
org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:109)
at org.hibernate.jdbc.JDBCContext.connection(JDBCContext.java:137) at
org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:57) at
org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1262) at
org.jbpm.persistence.db.DbPersistenceService.getSession(DbPersistenceService.java:98)
at
org.jbpm.persistence.db.DbPersistenceService.getGraphSession(DbPersistenceService.java:216)
at org.jbpm.JbpmContext.getGraphSession(JbpmContext.java:427) at
com.orbitz.txn.jbpm.TransactionWorkflowImpl.initContext(TransactionWorkflowImpl.java:449)
at
com.orbitz.txn.jbpm.TransactionWorkflowImpl.init(TransactionWorkflowImpl.java:250)
at
com.orbitz.txn.jbpm.command.CommandContextImplTest.testGet(CommandContextImplTest.java:113)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)Caused
by: com.mysql.jdbc.CommunicationsException: Communications link failure due to
underlying exception: ** BEGIN NESTED EXCEPTION **
java.net.SocketExceptionMESSAGE: java.net.ConnectException: Connection
refusedSTACKTRACE:java.net.SocketException: java.net.ConnectException:
Connection refused at
com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:151) at
com.mysql.jdbc.MysqlIO.(MysqlIO.java:280) at
com.mysql.jdbc.Connection.createNewIO(Connection.java:1774) at
com.mysql.jdbc.Connection.(Connection.java:437) at
com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:268) at
java.sql.DriverManager.getConnection(DriverManager.java:512) at
java.sql.DriverManager.getConnection(DriverManager.java:140) at
org.hibernate.connection.DriverManagerConnectionProvider.getConnection(DriverManagerConnectionProvider.java:110)
at
org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:315)
at
org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:109)
at org.hibernate.jdbc.JDBCContext.connection(JDBCContext.java:137) at
org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:57) at
org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1262) at
org.jbpm.persistence.db.DbPersistenceService.getSession(DbPersistenceService.java:98)
at
org.jbpm.persistence.db.DbPersistenceService.getGraphSession(DbPersistenceService.java:216)
at org.jbpm.JbpmContext.getGraphSession(JbpmContext.java:427) at
com.orbitz.txn.jbpm.TransactionWorkflowImpl.initContext(TransactionWorkflowImpl.java:449)
at
com.orbitz.txn.jbpm.TransactionWorkflowImpl.init(TransactionWorkflowImpl.java:250)
at
com.orbitz.txn.jbpm.command.CommandContextImplTest.testGet(CommandContextImplTest.java:113)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)**
END NESTED EXCEPTION ** at
com.mysql.jdbc.Connection.createNewIO(Connection.java:1839) at
com.mysql.jdbc.Connection.(Connection.java:437) at
com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:268) at
java.sql.DriverManager.getConnection(DriverManager.java:512) at
java.sql.DriverManager.getConnection(DriverManager.java:140) at
org.hibernate.connection.DriverManagerConnectionProvider.getConnection(DriverManagerConnectionProvider.java:110)
at
org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:315)
... 25 more
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