NullPointerException being thrown for unknown reason. No subsequent queries then succeed.

[MurrayFurtado]

Any idea why this is happening? It just suddenly starts happening.

java.lang.NullPointerException: null at org.hibernate.engine.internal.StatefulPersistenceContext.clear(StatefulPersistenceContext.java:235) at org.hibernate.internal.SessionImpl.internalClear(SessionImpl.java:395) at org.hibernate.internal.SessionImpl.clear(SessionImpl.java:387) at sun.reflect.GeneratedMethodAccessor98.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:350) at com.sun.proxy.$Proxy131.clear(Unknown Source) at com.introproventures.graphql.jpa.query.schema.impl.GraphQLJpaQueryDataFetcher.get(GraphQLJpaQueryDataFetcher.java:113) at graphql.execution.ExecutionStrategy.fetchField(ExecutionStrategy.java:261) at graphql.execution.ExecutionStrategy.resolveFieldWithInfo(ExecutionStrategy.java:202) at graphql.execution.AsyncExecutionStrategy.execute(AsyncExecutionStrategy.java:70) at graphql.execution.Execution.executeOperation(Execution.java:159) at graphql.execution.Execution.execute(Execution.java:101) at graphql.GraphQL.execute(GraphQL.java:573) at graphql.GraphQL.parseValidateAndExecute(GraphQL.java:515) at graphql.GraphQL.executeAsync(GraphQL.java:489) at graphql.GraphQL.execute(GraphQL.java:420) at com.introproventures.graphql.jpa.query.schema.impl.GraphQLJpaExecutor.execute(GraphQLJpaExecutor.java:72)

[igdianov]

@MurrayFurtado The GraphQLJpaQueryDataFetcher.get is calling EntityManager.clear() to clear session persistent context to avoid getting stale objects cached in the same session between requests with different search criteria:

graphql-jpa-query/graphql-jpa-query-schema/src/main/java/com/introproventures/graphql/jpa/query/schema/impl/GraphQLJpaQueryDataFetcher.java

Line 113 in 7ce947d

entityManager.clear();

This looked like a Hibernate bug to me. I had a problems before using clear with Hibernate not detecting new search criteria for the same query and returning first result from object cache for the second query.

Have you updated any dependencies lately?