Question

我们在运行基于JDO的程序时在运行时获得Null指针异常。

java.lang.NullPointerException
    at org.datanucleus.ExecutionContextPool.checkOut(ExecutionContextPool.java:97)
    at org.datanucleus.PersistenceNucleusContextImpl.getExecutionContext(PersistenceNucleusContextImpl.java:1130)
    at org.datanucleus.api.jdo.JDOPersistenceManager.<init>(JDOPersistenceManager.java:143)
    at org.datanucleus.api.jdo.JDOPersistenceManagerFactory.newPM(JDOPersistenceManagerFactory.java:853)
    at org.datanucleus.api.jdo.JDOPersistenceManagerFactory.getPersistenceManager(JDOPersistenceManagerFactory.java:832)
    at org.datanucleus.api.jdo.JDOPersistenceManagerFactory.getPersistenceManager(JDOPersistenceManagerFactory.java:813)

我们正在使用JDO 4.0。场景是：该应用程序在一段时间内完美运行，但经过一段时间后，在运行过程中我们遇到了Nullpointer异常。

同样的解决方案是什么？ PMF正在使用Spring创建。

<!--PersistenceManagerFactory -->
    <bean id="pmf" class="org.datanucleus.api.jdo.JDOPersistenceManagerFactory"
        destroy-method="close">
        <property name="connectionFactory" ref="dataSource" />
        <property name="schema" value="PROVISIONING" />
        <property name="persistenceProperties">
            <map>
                <entry key="datanucleus.metadata.supportORM" value="true" />
                <entry key="datanucleus.autoCreateTables" value="true" />
                <entry key="datanucleus.autoCreateColumns" value="true" />
                <entry key="datanucleus.autoCreateConstraints" value="true" />
                <entry key="datanucleus.autoCreateSchema" value="false" />
                <entry key="javax.jdo.mapping.Schema" value="PROVISIONING" />
                <entry key="datanucleus.manageRelationshipsChecks" value="true" />
                <entry key="datanucleus.identifier.case" value="UpperCase" />
                <entry key="datanucleus.validateTables" value="false" />
                <entry key="datanucleus.validateConstraints" value="false" />
                <entry key="datanucleus.validateColumns" value="false" />
                <entry key="datanucleus.rdbms.CheckExistTablesOrViews" value="false" />
                <entry key="datanucleus.rdbms.initializeColumnInfo" value="None" />
                <entry key="javax.jdo.option.Mapping" value="h2" />
                <entry key="datanucleus.storeManagerType" value="rdbms" />
                <entry key="datanucleus.Multithreaded" value="true" />
                <entry key="datanucleus.metadata.allowAnnotations" value="false" />
                <entry key="datanucleus.enableStatistics" value="true" />
            </map>

        </property>
    </bean>

运行基于JDO的程序时，在运行时出现Null指针异常

0 个答案: