[Fix #3677] Alternative approach

jbpm/jbpm-flow/src/main/java/org/jbpm/workflow/instance/impl/MessageException.java

@@ -0,0 +1,27 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.jbpm.workflow.instance.impl;
+
+public class MessageException extends IllegalArgumentException {
+    private static final long serialVersionUID = 1L;
+
+    public MessageException(String message) {
+        super(message);
+    }
+}

jbpm/jbpm-flow/src/main/java/org/jbpm/workflow/instance/impl/WorkflowProcessInstanceImpl.java

@@ -1164,7 +1164,7 @@ public void setErrorState(NodeInstance nodeInstanceInError, Exception e) {
         this.nodeInstanceIdInError = nodeInstanceInError.getId();
         this.errorCause = Optional.of(e);
         Throwable rootException = getRootException(e);
-        this.errorMessage = rootException.getMessage() == null ? rootException.getClass().getCanonicalName() : rootException.getMessage();
+        this.errorMessage = rootException instanceof MessageException ? rootException.getMessage() : rootException.getClass().getCanonicalName() + " - " + rootException.getMessage();
         setState(STATE_ERROR);
         logger.error("Unexpected error while executing node {} in process instance {}", nodeInstanceInError.getNode().getName(), this.getStringId(), e);
         ((InternalProcessRuntime) getKnowledgeRuntime().getProcessRuntime()).getProcessEventSupport().fireOnError(this, nodeInstanceInError, getKnowledgeRuntime(), e);

kogito-serverless-workflow/kogito-serverless-workflow-runtime/src/main/java/org/kie/kogito/serverless/workflow/actions/ErrorExpressionAction.java

@@ -20,6 +20,7 @@
 
 import org.jbpm.process.instance.ProcessInstance;
 import org.jbpm.workflow.instance.NodeInstance;
+import org.jbpm.workflow.instance.impl.MessageException;
 import org.kie.kogito.internal.process.runtime.KogitoProcessContext;
 
 import com.fasterxml.jackson.databind.JsonNode;
@@ -44,7 +45,7 @@ public void execute(KogitoProcessContext context) throws Exception {
         }
     }
 
-    private void setError(KogitoProcessContext context, String error) {
-        ((ProcessInstance) context.getProcessInstance()).setErrorState((NodeInstance) context.getNodeInstance(), new IllegalArgumentException(error));
+    private void setError(KogitoProcessContext context, String message) {
+        ((ProcessInstance) context.getProcessInstance()).setErrorState((NodeInstance) context.getNodeInstance(), new MessageException(message));
     }
 }