save Throwable as Java object for each failure (#151)

* Save throwable as object

Wrap Throwable in Optional

* Make Failure serializable

* Add easymock as dependency

* Revert "Add easymock as dependency"

This reverts commit 7690aa1.

* Use SerializableThrowable to save to file

src/main/java/eu/stamp_project/testrunner/runner/Failure.java

@@ -13,11 +13,14 @@
  */
 public class Failure implements Serializable {
 
+    private final static long serialVersionUID = 4319480863941757524L;
+
     public final String testCaseName;
     public final String testClassName;
     public final String fullQualifiedNameOfException;
     public final String messageOfFailure;
     public final String stackTrace;
+    public SerializableThrowable throwable; // Throwable is not present if Failure is read from surefire report
 
     public Failure(String testCaseName, String testClassName, Throwable exception) {
         this.testCaseName = testCaseName;
@@ -28,6 +31,7 @@ public Failure(String testCaseName, String testClassName, Throwable exception) {
         PrintWriter pw = new PrintWriter(sw);
         exception.printStackTrace(pw);
         this.stackTrace = sw.toString(); // stack trace as a string
+        this.throwable = new SerializableThrowable(exception);
     }
 
     public Failure(String testCaseName, String testClassName, String fullQualifiedNameOfException, String messageOfFailure, String stackTrace) {
@@ -64,4 +68,21 @@ public int hashCode() {
         result = 31 * result + (messageOfFailure != null ? messageOfFailure.hashCode() : 0);
         return result;
     }
+
+
+    public static class SerializableThrowable implements Serializable {
+
+        private static final long serialVersionUID = 2988580623727952827L;
+
+        public final String className;
+        public final String message;
+        public final StackTraceElement[] stackTrace;
+
+        public SerializableThrowable(Throwable throwable) {
+            this.className = throwable.getClass().getName();
+            this.message = throwable.getMessage();
+            this.stackTrace = throwable.getStackTrace();
+        }
+    }
+
 }