GJL commented on a change in pull request #7974: [FLINK-11902][rest] Do not 
wrap all exceptions in RestHandlerException 
URL: https://github.com/apache/flink/pull/7974#discussion_r265156558
 
 

 ##########
 File path: 
flink-runtime-web/src/test/java/org/apache/flink/runtime/webmonitor/handlers/JarRunHandlerTest.java
 ##########
 @@ -90,6 +90,8 @@ public void testRunJar() throws Exception {
                                        if (expected.isPresent()) {
                                                // implies the job was actually 
submitted
                                                
assertTrue(expected.get().getMessage().contains("ProgramInvocationException"));
+                                               // original cause is preserved 
in stack trace
+                                               
assertTrue(expected.get().getMessage().contains("ZipException"));
 
 Review comment:
   I would prefer hamcrest for a proper failure message:
   
   ```
   import static org.hamcrest.Matchers.containsString;
   import static org.junit.Assert.assertThat;
   ...
   assertThat(expected.get().getMessage(), containsString("ZipException"))
   ```

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