Hi,
in a recent version of the HANA JDBC driver the new JDBC 4.3 features that came
with Java 9 have been implemented. The driver itself is still compiled for Java
7 (javac -target 1.7). So the driver should also be usable with a JVM 7 or 8.
This works as expected until Java reflection is used to determine, for example,
the existence of a method on the connection class. Hibernate uses this approach
in
org.hibernate.engine.jdbc.env.internal.DefaultSchemaNameResolver#determineAppropriateResolverDelegate
to determine if the connection class implements the #getSchema method. In this
case the JVM tries to load the entire connection class including the
non-existing new interface java.sql.ShardingKey. The result is a
java.lang.NoClassDefFoundError being thrown which isn't caught anywhere causing
the Hibernate bootstrapping process to fail. I've attached a sample stack trace
to this mail.
Situations like this can also occur in other places, for example, when getting
a connection from a Hikari connection pool.
My question is now how you think Hibernate should handle situations like this.
Do you see it as a JDBC driver issue? Should Hibernate ignore the error and
continue with a conservative guess if possible (e.g. assume that the connection
class doesn't implement #getSchema)?
Thanks,
Jonathan
java.lang.NoClassDefFoundError: java/sql/ShardingKey
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
at java.lang.Class.privateGetMethodRecursive(Class.java:3048)
at java.lang.Class.getMethod0(Class.java:3018)
at java.lang.Class.privateGetMethodRecursive(Class.java:3058)
at java.lang.Class.getMethod0(Class.java:3018)
at java.lang.Class.getMethod(Class.java:1784)
at
org.hibernate.engine.jdbc.env.internal.DefaultSchemaNameResolver.determineAppropriateResolverDelegate(DefaultSchemaNameResolver.java:43)
at
org.hibernate.engine.jdbc.env.internal.DefaultSchemaNameResolver.resolveSchemaName(DefaultSchemaNameResolver.java:69)
at
org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentImpl.determineCurrentSchemaName(JdbcEnvironmentImpl.java:298)
at
org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentImpl.<init>(JdbcEnvironmentImpl.java:232)
at
org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:114)
at
org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:1)
at
org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.initiateService(StandardServiceRegistryImpl.java:88)
at
org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:258)
at
org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:232)
at
org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:209)
at
org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:51)
at
org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:94)
at
org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:241)
at
org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:209)
at
org.hibernate.boot.model.process.spi.MetadataBuildingProcess.handleTypes(MetadataBuildingProcess.java:356)
at
org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:112)
at
org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:861)
at
org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:888)
at
org.hibernate.jpa.test.BaseEntityManagerFunctionalTestCase.buildEntityManagerFactory(BaseEntityManagerFunctionalTestCase.java:78)
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
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at
org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:24)
at
org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
at
org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:298)
at
org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:292)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ClassNotFoundException: java.sql.ShardingKey
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 39 more
java.lang.NullPointerException
at
org.hibernate.jpa.test.BaseEntityManagerFunctionalTestCase.getOrCreateEntityManager(BaseEntityManagerFunctionalTestCase.java:304)
at
org.hibernate.jpa.test.criteria.basic.AggregationResultTest.cleanUpTestData(AggregationResultTest.java:52)
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
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at
org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:33)
at
org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:298)
at
org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:292)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.lang.Thread.run(Thread.java:745)
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