ISSUE-688 # Propagate exceptions from java api operations

core/src/main/java/org/jsmart/zerocode/core/AddService.java

@@ -21,6 +21,12 @@ public Integer squareMyNumber(MyNumber myNumber) {
         return myNumber.getNumber() * myNumber.getNumber();
     }
 
+    public Double squareRoot(Double number) {
+    	if (number < 0.0)
+    		throw new RuntimeException("Can not square root a negative number");
+        return Math.sqrt(number);
+    }
+
     public Integer anInteger() {
         logger.debug("Returning a number ");
 

core/src/main/java/org/jsmart/zerocode/core/engine/executor/javaapi/JavaMethodExecutorImpl.java

@@ -111,7 +111,7 @@ Object executeWithParams(String qualifiedClassName, String methodName, Object...
         } catch (Exception e) {
             String errMsg = format("Java exec(): Invocation failed for method %s in class %s", methodName, qualifiedClassName);
             LOGGER.error(errMsg + ". Exception - " + e);
-            throw new RuntimeException(errMsg);
+            throw new RuntimeException(errMsg, e);
         }
     }
 

core/src/test/java/org/jsmart/zerocode/core/engine/executor/javaapi/JavaMethodExecutorImplTest.java

@@ -3,6 +3,7 @@
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.google.inject.Guice;
 import com.google.inject.Injector;
+import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 import java.util.List;
 import org.jsmart.zerocode.core.di.main.ApplicationMainModule;
@@ -16,6 +17,9 @@
 
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.core.Is.is;
+import static org.hamcrest.core.StringContains.containsString;
+import static org.hamcrest.CoreMatchers.notNullValue;
+import static org.junit.Assert.assertThrows;
 
 public class JavaMethodExecutorImplTest {
 
@@ -124,6 +128,29 @@ public void willExecuteJsonRequestFor_CustomObject_java_method() throws Exceptio
         assertThat(result, is(900));
     }
 
+    @Test
+    public void willPropagateExceptions() throws Exception {
+        String scenariosJsonAsString = SmartUtils.readJsonAsString("unit_test_files/java_apis/03_test_json_java_service_method_Exception.json");
+        final ScenarioSpec scenarioSpec = smartUtils.getMapper().readValue(scenariosJsonAsString, ScenarioSpec.class);
+
+        String serviceName = scenarioSpec.getSteps().get(0).getUrl();
+        String methodName = scenarioSpec.getSteps().get(0).getOperation();
+        String requestJson = scenarioSpec.getSteps().get(0).getRequest().toString();
+        List<Class<?>> argumentTypes = methodExecutor.getParameterTypes(serviceName, methodName);
+
+        Object request = mapper.readValue(requestJson, argumentTypes.get(0));
+
+        RuntimeException exception = assertThrows(RuntimeException.class, () -> {
+        	methodExecutor.executeWithParams(serviceName, methodName, request);
+		});
+        exception.printStackTrace();
+        assertThat(exception.getMessage(), containsString("Invocation failed for method squareRoot"));
+        // The target exception is included in this exception (inside of the InvocationTargetException)
+        assertThat(exception.getCause(), is(notNullValue()));
+        assertThat(((InvocationTargetException)exception.getCause()).getTargetException().getMessage(), 
+        		is("Can not square root a negative number"));
+    }
+
     @Test
     public void willExecuteJsonWithParams_CustomObject_viaJson() throws Exception {
         String requestJson = "{\n" +

core/src/test/resources/unit_test_files/java_apis/03_test_json_java_service_method_Exception.json

@@ -0,0 +1,13 @@
+{
+  "scenarioName": "Given_When_Then-Flow name For Java Service",
+  "steps": [
+    {
+      "name": "javaMethodException",
+      "url": "org.jsmart.zerocode.core.AddService",
+      "operation": "squareRoot",
+      "request": "-255.0", //<-- This negative number should throw an exception
+      "assertions": {
+      }
+    }
+  ]
+}