HSQLDB prepareStatement(“设置架构?")错误

Question

我正在编写一个Jbatch服务，它需要与HSQLDB连接，但在某个时刻它抛出了一个NullPointerException (以及一些SQLException/ PersistenceExceptions)。调试时，我发现在JDBCPersistenceManagerImpl.java类中，它将模式设置为?，但在HSQLDB中似乎不支持。

private void setSchemaOnConnection(Connection connection) throws SQLException {
        logger.finest("Entering " + CLASSNAME +".setSchemaOnConnection()");

        if (!"Oracle".equals(connection.getMetaData().getDatabaseProductName())) {
            PreparedStatement ps = null;
            ps = connection.prepareStatement("SET SCHEMA ?");  -->ps = NullPointerException 
            ps.setString(1, schema);
            ps.executeUpdate(); 
            ps.close();
        }

        logger.finest("Exiting " + CLASSNAME +".setSchemaOnConnection()");
    }

有没有关于如何修复它的想法？我已经尝试了另一个数据库(H2 db)，但问题是一样的。

这是完整的堆栈跟踪：

javax.batch.operations.JobStartException: com.ibm.jbatch.container.exception.PersistenceException: java.sql.SQLException: java.lang.NullPointerException java.lang.NullPointerException

    at com.ibm.jbatch.container.api.impl.JobOperatorImpl.start(JobOperatorImpl.java:92)
    at factory.jf.privacy.service.loggedareasfilter.batch.AzzaTest.testBatchChunkException(AzzaTest.java:22)
    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:497)
    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.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:119)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:42)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:234)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:74)
    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:497)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)
Caused by: com.ibm.jbatch.container.exception.PersistenceException: java.sql.SQLException: java.lang.NullPointerException java.lang.NullPointerException
    at com.ibm.jbatch.container.services.impl.JDBCPersistenceManagerImpl.createJobInstance(JDBCPersistenceManagerImpl.java:1682)
    at com.ibm.jbatch.container.jobinstance.JobExecutionHelper.getNewJobInstance(JobExecutionHelper.java:89)
    at com.ibm.jbatch.container.jobinstance.JobExecutionHelper.startJob(JobExecutionHelper.java:120)
    at com.ibm.jbatch.container.impl.BatchKernelImpl.startJob(BatchKernelImpl.java:124)
    at com.ibm.jbatch.container.api.impl.JobOperatorImpl.startInternal(JobOperatorImpl.java:123)
    at com.ibm.jbatch.container.api.impl.JobOperatorImpl.start(JobOperatorImpl.java:88)
    ... 28 more
Caused by: java.sql.SQLException: java.lang.NullPointerException java.lang.NullPointerException
    at org.hsqldb.jdbc.JDBCUtil.sqlException(Unknown Source)
    at org.hsqldb.jdbc.JDBCUtil.sqlException(Unknown Source)
    at org.hsqldb.jdbc.JDBCPreparedStatement.<init>(Unknown Source)
    at org.hsqldb.jdbc.JDBCConnection.prepareStatement(Unknown Source)
    at org.apache.commons.dbcp.DelegatingConnection.prepareStatement(DelegatingConnection.java:281)
    at org.apache.commons.dbcp.DelegatingConnection.prepareStatement(DelegatingConnection.java:281)
    at com.ibm.jbatch.container.services.impl.JDBCPersistenceManagerImpl.setSchemaOnConnection(JDBCPersistenceManagerImpl.java:396)
    at com.ibm.jbatch.container.services.impl.JDBCPersistenceManagerImpl.getConnection(JDBCPersistenceManagerImpl.java:334)
    at com.ibm.jbatch.container.services.impl.JDBCPersistenceManagerImpl.createJobInstance(JDBCPersistenceManagerImpl.java:1670)
    ... 33 more

Answer 1

编译此预准备语句会产生一个带有hsqldb的NullPointerExcepion

Caused by: org.hsqldb.HsqlException: java.lang.NullPointerException
    at org.hsqldb.error.Error.error(Unknown Source)
    at org.hsqldb.result.Result.newErrorResult(Unknown Source)
    at org.hsqldb.Session.execute(Unknown Source)
    ... 41 more
Caused by: java.lang.NullPointerException
    at org.hsqldb.ParserCommand.compileSet(Unknown Source)
    at org.hsqldb.ParserCommand.compilePart(Unknown Source)
    at org.hsqldb.ParserCommand.compileStatement(Unknown Source)
    at org.hsqldb.Session.compileStatement(Unknown Source)
    at org.hsqldb.StatementManager.compile(Unknown Source)
    ... 42 more

但是，当您将其更改为不带占位符的语句时，它将起作用：

ps = connection.prepareStatement("SET SCHEMA "+schema);
ps.execute();