[#6613] Add TransactionContext.causeThrowable() to allow for Throwable causes for transaction rollbacks

jOOQ/src/main/java/org/jooq/TransactionContext.java

@@ -60,13 +60,28 @@ public interface TransactionContext extends Scope {
     /**
      * The exception that has caused the rollback.
      *
-     * @return The exception. May be <code>null</code>.
+     * @return The exception. May be <code>null</code>, in particular if the
+     *         cause is a {@link Throwable}, in case of which
+     *         {@link #causeThrowable()} should be called.
      */
     Exception cause();
 
+    /**
+     * The throwable that has caused the rollback.
+     *
+     * @return The throwable. May be <code>null</code>.
+     */
+    Throwable causeThrowable();
+
     /**
      * Set the exception that has caused the rollback to the current transaction
      * context.
      */
     TransactionContext cause(Exception cause);
+
+    /**
+     * Set the throwable that has caused the rollback to the current transaction
+     * context.
+     */
+    TransactionContext causeThrowable(Throwable cause);
 }

jOOQ/src/main/java/org/jooq/impl/DefaultTransactionContext.java

@@ -44,7 +44,7 @@ import org.jooq.TransactionContext;
 class DefaultTransactionContext extends AbstractScope implements TransactionContext {
 
     Transaction                 transaction;
-    Exception                   cause;
+    Throwable                   cause;
 
     DefaultTransactionContext(Configuration configuration) {
         super(configuration);
@@ -63,7 +63,7 @@ class DefaultTransactionContext extends AbstractScope implements TransactionCont
 
     @Override
     public final Exception cause() {
-        return cause;
+        return cause instanceof Exception ? (Exception) cause : null;
     }
 
     @Override
@@ -71,4 +71,15 @@ class DefaultTransactionContext extends AbstractScope implements TransactionCont
         cause = c;
         return this;
     }
+
+    @Override
+    public final Throwable causeThrowable() {
+        return cause;
+    }
+
+    @Override
+    public final TransactionContext causeThrowable(Throwable c) {
+        cause = c;
+        return this;
+    }
 }