Basically I have the following client-side code:

CustomerList cust = null;
try {
cust = proxy.findCustomers(lastname);
}
catch (ClientResponseFailure e) {
final ClientResponse<?> response = e.getResponse();
final String errorMsg = response.getEntity(String.class); // Crash
...
}

When invoking getEntity inside the catch clause I get this stacktrace:

org.jboss.resteasy.spi.ReaderException: java.io.IOException: Stream closed
at org.jboss.resteasy.core.messagebody.ReaderUtility.doRead(ReaderUtility.java:123)
at org.jboss.resteasy.client.core.BaseClientResponse.readFrom(BaseClientResponse.java:246)
at org.jboss.resteasy.client.core.BaseClientResponse.getEntity(BaseClientResponse.java:210)
at org.jboss.resteasy.client.core.BaseClientResponse.getEntity(BaseClientResponse.java:183)
at org.jboss.resteasy.client.core.BaseClientResponse.getEntity(BaseClientResponse.java:177)
at de.hska.test.KundenverwaltungTest.findKundenByNachnameNichtVorhanden(KundenverwaltungTest.java:162)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:613)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
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)
Caused by: java.io.IOException: Stream closed
at java.io.BufferedInputStream.getInIfOpen(BufferedInputStream.java:151)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:235)
at java.io.BufferedInputStream.read1(BufferedInputStream.java:275)
at java.io.BufferedInputStream.read(BufferedInputStream.java:334)
at org.jboss.resteasy.client.core.SelfExpandingBufferredInputStream.read(SelfExpandingBufferredInputStream.java:58)
at org.jboss.resteasy.plugins.providers.ProviderHelper.readString(ProviderHelper.java:72)
at org.jboss.resteasy.plugins.providers.StringTextStar.readFrom(StringTextStar.java:37)
at org.jboss.resteasy.plugins.providers.StringTextStar.readFrom(StringTextStar.java:23)
at org.jboss.resteasy.core.interception.MessageBodyReaderContextImpl.proceed(MessageBodyReaderContextImpl.java:105)
at org.jboss.resteasy.plugins.interceptors.encoding.GZIPDecodingInterceptor.read(GZIPDecodingInterceptor.java:46)
at org.jboss.resteasy.core.interception.MessageBodyReaderContextImpl.proceed(MessageBodyReaderContextImpl.java:108)
at org.jboss.resteasy.core.messagebody.ReaderUtility.doRead(ReaderUtility.java:111)
... 28 more