问题
I am trying to run a sample jbpm project in eclipse and I am using persistence.Whereas it gives an error on this line
RuntimeManager runtimeManager = RuntimeManagerFactory.Factory.get().newSingletonRuntimeManager(environment)
Error : (I have also attached the error screenshot ) Any sort of information would be really helpful.
Caused by: org.postgresql.util.PSQLException: ERROR: null value in column "id" violates not-null constraint Detail: Failing row contains (null, null, null, 2017-05-21 19:45:26.28, 0). at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2284) at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:2003) at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:200) at org.postgresql.jdbc.PgStatement.execute(PgStatement.java:424) at org.postgresql.jdbc.PgPreparedStatement.executeWithFlags(PgPreparedStatement.java:161) at org.postgresql.jdbc.PgPreparedStatement.executeUpdate(PgPreparedStatement.java:133) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at bitronix.tm.resource.jdbc.BaseProxyHandlerClass.invoke(BaseProxyHandlerClass.java:64) at com.sun.proxy.$Proxy45.executeUpdate(Unknown Source) at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:208) ... 36 more
来源：https://stackoverflow.com/questions/44104328/error-in-jbpm-sample-project-using-persistence-and-postgres