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POPowermock and Spring cause ConversionException when injecting EntityManager in test
 

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    <p>When attempting to combine the Spring test runner and the PowerMock runner using the <a href="http://code.google.com/p/powermock/wiki/PowerMockRule" rel="noreferrer">PowerMockRule technique</a>, I get an exception from the Thoughtworks XStream library whenever I try to inject an <code>EntityManager</code> using the <code>PersistenceContext</code> annotation from JPA. The same test works fine when not using the <code>PowerMockRule</code>. I also ignore all packages from the PowerMockLoader at the start of the test. I tried various values for <code>@PowerMockIgnore</code> as this normally solves issues I have with PowerMock, however, this error still happens even when ignoring absolutely every package. </p> <pre><code>@PowerMockIgnore("*") @RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration("/test-configuration.xml") public class SpringAndPowerMockTest { @Rule public PowerMockRule rule = new PowerMockRule(); @PersistenceContext private EntityManager manager; @Test public void test() { } } </code></pre> <p>The exception is as follows -- links to full backtrace on pastebin the backtrace exceeded the limit for question length):</p> <p><a href="http://pastebin.com/XcS5gUpn" rel="noreferrer"><code>com.thoughtworks.xstream.converters.ConversionException: Could not call org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.readObject() : Could not call java.util.concurrent.CopyOnWriteArrayList.readObject() : Could not call java.security.CodeSource.readObject() : null</code></a></p> <p>Relevant persistence unit: </p> <pre><code>&lt;persistence-unit name="inMemory"&gt; &lt;provider&gt;org.hibernate.ejb.HibernatePersistence&lt;/provider&gt; &lt;properties&gt; &lt;property name="hibernate.connection.driver_class" value="org.h2.Driver" /&gt; &lt;property name="hibernate.connection.url" value="jdbc:h2:mem:InMemoryUnitTests;MODE=MySQL;DB_CLOSE_ON_EXIT=FALSE" /&gt; &lt;property name="hibernate.connection.username" value="sa" /&gt; &lt;property name="hibernate.connection.password" value="" /&gt; &lt;property name="hibernate.hbm2ddl.auto" value="create-drop" /&gt; &lt;/properties&gt; &lt;/persistence-unit&gt; </code></pre> <p>Maven dependencies: </p> <pre><code>&lt;dependencies&gt; &lt;dependency&gt; &lt;groupId&gt;org.powermock&lt;/groupId&gt; &lt;artifactId&gt;powermock-module-junit4&lt;/artifactId&gt; &lt;version&gt;1.5.1&lt;/version&gt; &lt;scope&gt;test&lt;/scope&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;org.powermock&lt;/groupId&gt; &lt;artifactId&gt;powermock-api-mockito&lt;/artifactId&gt; &lt;version&gt;1.5.1&lt;/version&gt; &lt;scope&gt;test&lt;/scope&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;org.mockito&lt;/groupId&gt; &lt;artifactId&gt;mockito-core&lt;/artifactId&gt; &lt;version&gt;1.9.5&lt;/version&gt; &lt;scope&gt;test&lt;/scope&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;org.powermock&lt;/groupId&gt; &lt;artifactId&gt;powermock-api-easymock&lt;/artifactId&gt; &lt;version&gt;1.5.1&lt;/version&gt; &lt;scope&gt;test&lt;/scope&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;org.powermock&lt;/groupId&gt; &lt;artifactId&gt;powermock-module-junit4-rule&lt;/artifactId&gt; &lt;version&gt;1.5.1&lt;/version&gt; &lt;scope&gt;test&lt;/scope&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;org.powermock&lt;/groupId&gt; &lt;artifactId&gt;powermock-classloading-xstream&lt;/artifactId&gt; &lt;version&gt;1.5.1&lt;/version&gt; &lt;scope&gt;test&lt;/scope&gt; &lt;/dependency&gt; &lt;/dependencies&gt; </code></pre> <p>Testing using Spring <code>3.2.3.RELEASE</code>. Note that I have also tested with spring-test version <code>3.0.5.RELEASE</code> which does indeed resolve some other errors with the Spring/Powermock combination, but not this one.</p>
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    1. COWhat version of XStream are you using? Do you have any custom XStream converters registered? I experienced a problem where I had a custom XStream converter. Custom converters get invoked before other converters, but since I was subclassing the XStream supplied MapConverter whose canConvert method is not null safe I was getting a null pointer exception (normally the NullConverter is at the top of the list). Solution was to make my custom converter's canConvert method null-safe. But judging from your stack traces this looks like something else...
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      1. POPowermock and Spring cause ConversionException when injecting EntityManager in test
      1. USJustin Rowe
    2. COThe xstream version resolves transitively to 1.4.2 through the `powermock-classloading-xstream` dependency. I don't have any other code except for the test shown, so don't have any custom converters...
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    3. COIn my experience with Powermock 1.5, it is not compatible with Xstream 1.4.2, I haven't been able to track down the cause; odd then that that is what powermock-classloading-xstream resolves to. I suggest to try adding XStream 1.2.2 as a direct dependency in your pom.
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