Merge pull request #74 from cxcorp/mavenplugin-log-files

Fix MavenPlugin returning empty stdout&stderr data

Author: nygrenh

tmc-langs-java/src/main/java/fi/helsinki/cs/tmc/langs/java/maven/MavenInvokatorMavenTaskRunner.java

@@ -63,7 +63,9 @@ public MavenExecutionResult exec(Path projectPath, String[] mavenArgs) {
         invoker.setMavenHome(new File(mavenHome));
 
         final ByteArrayOutputStream outBuf = new ByteArrayOutputStream();
+        final ByteArrayOutputStream errBuf = new ByteArrayOutputStream();
         final PrintStream out = new PrintStream(outBuf);
+        final PrintStream err = new PrintStream(errBuf);
 
         InvocationResult result = null;
         request.setPomFile(projectPath.resolve("pom.xml").toFile());
@@ -73,18 +75,29 @@ public MavenExecutionResult exec(Path projectPath, String[] mavenArgs) {
 
                     @Override
                     public void consumeLine(String line) {
-                        log.info("MavenInvokator: m{}", line);
-                        out.append(line);
+                        log.info("MavenInvokator: {}", line);
+                        out.println(line);
+                    }
+                });
+        request.setErrorHandler(
+                new InvocationOutputHandler() {
+
+                    @Override
+                    public void consumeLine(String line) {
+                        log.info("MavenInvokator: {}", line);
+                        err.println(line);
                     }
                 });
 
         request.setGoals(Arrays.asList(mavenArgs));
 
-        MavenExecutionResult compilationResult =
-                new MavenExecutionResult().setStdOut(outBuf.toByteArray()).setStdErr(new byte[0]);
+        MavenExecutionResult compilationResult = new MavenExecutionResult();
         try {
             result = invoker.execute(request);
             compilationResult.setExitCode(result.getExitCode());
+            // outBuf and errBuf are empty until invoker is executed
+            compilationResult.setStdOut(outBuf.toByteArray());
+            compilationResult.setStdErr(errBuf.toByteArray());
             CommandLineException exp = result.getExecutionException();
             if (exp != null) {
                 throw new MavenExecutorException(exp);

tmc-langs-java/src/main/java/fi/helsinki/cs/tmc/langs/java/maven/MavenPlugin.java

@@ -106,7 +106,7 @@ protected TestRunFileAndLogs createRunResultFile(Path path)
         return new TestRunFileAndLogs(
                 path.toAbsolutePath().resolve(RESULT_FILE).toFile(),
                 result.getStdOut(),
-                result.getStdOut());
+                result.getStdErr());
     }
 
     @Override

tmc-langs-java/src/test/java/fi/helsinki/cs/tmc/langs/java/maven/MavenPluginTest.java

@@ -16,7 +16,6 @@
 
 import java.io.File;
 import java.io.IOException;
-import java.io.UnsupportedEncodingException;
 import java.nio.file.Path;
 import java.util.List;
 import java.util.Locale;
@@ -76,6 +75,19 @@ public void testRunTestsWhenBuildFailing() {
         assertEquals(RunResult.Status.COMPILE_FAILED, runResult.status);
     }
 
+    @Test
+    public void testRunTestsOutputLogIsNotEmptyWhenBuildFails() throws IOException {
+        Path project = TestUtils.getPath(getClass(), "failing_maven_exercise");
+        RunResult result = mavenPlugin.runTests(project);
+
+        byte[] stdoutBytes = result.logs.get("stdout");
+        String stdoutLog = new String(stdoutBytes, "utf-8");
+        assertTrue( "Expected stdout log of failed maven test build to contain any text",
+                    stdoutLog.length() > 0);
+        assertTrue("Expected stdout log of failed maven test build to contain \"BUILD_FAILURE\"!",
+                    stdoutLog.contains("BUILD FAILURE"));
+    }
+
     @Test
     public void testMavenProjectWithFailingTestsCompilesAndFailsTests() {
         Path path = TestUtils.getPath(getClass(), "maven_exercise");