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当我尝试运行使用DBUnit的单元测试之一时，出现NoPrimaryKeyException。数据表是使用Hibernate创建的，并且是映射多对多关系的两个类之间的连接表。是定义关系的注解如下：将数据集加载到数据库时，DBUnit出现NoPrimaryKeyException
@Override
@ManyToMany
@JoinTable(name="offset_file_offset_entries", joinColumns={@JoinColumn(name="offset_entry_id")},inverseJoinColumns={@JoinColumn(name="file_description_id")})
public List<OffsetEntry> getOffsets() {
在我使用来定义数据集的XML文件中的其他条目似乎工作正常，但没有连接表。我得到以下异常：
org.dbunit.dataset.NoPrimaryKeyException: offset_file_offset_entries
at org.dbunit.operation.UpdateOperation.getOperationData(UpdateOperation.java:72)
at org.dbunit.operation.RefreshOperation$UpdateRowOperation.<init>(RefreshOperation.java:266)
at org.dbunit.operation.RefreshOperation.createUpdateOperation(RefreshOperation.java:142)
at org.dbunit.operation.RefreshOperation.execute(RefreshOperation.java:100)
at org.dbunit.ext.mssql.InsertIdentityOperation.execute(InsertIdentityOperation.java:217)
at uk.co.sabio.obscheduler.application.dao.AbstractBaseDatabaseTest.setUp(AbstractBaseDatabaseTest.java:57)
at org.springframework.test.context.junit38.AbstractJUnit38SpringContextTests.runManaged(AbstractJUnit38SpringContextTests.java:332)
at org.springframework.test.context.junit38.AbstractJUnit38SpringContextTests.access$0(AbstractJUnit38SpringContextTests.java:326)
at org.springframework.test.context.junit38.AbstractJUnit38SpringContextTests$1.run(AbstractJUnit38SpringContextTests.java:216)
at org.springframework.test.context.junit38.AbstractJUnit38SpringContextTests.runTest(AbstractJUnit38SpringContextTests.java:296)
at org.springframework.test.context.junit38.AbstractJUnit38SpringContextTests.runTestTimed(AbstractJUnit38SpringContextTests.java:253)
at org.springframework.test.context.junit38.AbstractJUnit38SpringContextTests.runBare(AbstractJUnit38SpringContextTests.java:213)
at junit.framework.TestResult$1.protect(TestResult.java:110)
at junit.framework.TestResult.runProtected(TestResult.java:128)
at junit.framework.TestResult.run(TestResult.java:113)
at junit.framework.TestCase.run(TestCase.java:124)
at junit.framework.TestSuite.runTest(TestSuite.java:232)
at junit.framework.TestSuite.run(TestSuite.java:227)
at org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:83)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:46)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
有问题的数据集项看起来是这样的：
<offset_file_offset_entries offset_entry_id="1" file_description_id="1" />
而且有具有两个字段作为主键（该DATABSE是MS SQL Server的数据库是否相匹配帮助）有相应的条目在接合两个表中以下XML定义：
<dataset>
<file_description file_path="src/test/resources/" file_pattern=".txt" file_description_id="1"/>
<offset_file_description file_description_id="1"/>
<offset_entries offset_entry_id="1" field_name="Field1" field_length="10" start_index="0"/>
<offset_file_offset_entries offset_entry_id="1" file_description_id="1" />
</dataset>
我一定要定义休眠注解的主键？如果是的话我该怎么做？是否必须改变我定义数据集的方式以暗示这两列是联合主键？
我对hibernate或DBUnit不太熟练，因为这件事情，我在我的智慧结束，所以任何援助将非常感激。