--- a/hotspot/test/testlibrary/com/oracle/java/testlibrary/OutputAnalyzer.java	Fri Jan 30 09:32:23 2015 +0100
+++ b/hotspot/test/testlibrary/com/oracle/java/testlibrary/OutputAnalyzer.java	Fri Jan 30 20:20:11 2015 +0100
@@ -24,6 +24,8 @@
 package com.oracle.java.testlibrary;
 
 import java.io.IOException;
+import java.util.Arrays;
+import java.util.List;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
@@ -69,6 +71,58 @@
   }
 
   /**
+   * Verify that the stdout contents of output buffer is empty
+   *
+   * @throws RuntimeException
+   *             If stdout was not empty
+   */
+  public void stdoutShouldBeEmpty() {
+    if (!getStdout().isEmpty()) {
+      reportDiagnosticSummary();
+      throw new RuntimeException("stdout was not empty");
+    }
+  }
+
+  /**
+   * Verify that the stderr contents of output buffer is empty
+   *
+   * @throws RuntimeException
+   *             If stderr was not empty
+   */
+  public void stderrShouldBeEmpty() {
+    if (!getStderr().isEmpty()) {
+      reportDiagnosticSummary();
+      throw new RuntimeException("stderr was not empty");
+    }
+  }
+
+  /**
+   * Verify that the stdout contents of output buffer is not empty
+   *
+   * @throws RuntimeException
+   *             If stdout was empty
+   */
+  public void stdoutShouldNotBeEmpty() {
+    if (getStdout().isEmpty()) {
+      reportDiagnosticSummary();
+      throw new RuntimeException("stdout was empty");
+    }
+  }
+
+  /**
+   * Verify that the stderr contents of output buffer is not empty
+   *
+   * @throws RuntimeException
+   *             If stderr was empty
+   */
+  public void stderrShouldNotBeEmpty() {
+    if (getStderr().isEmpty()) {
+      reportDiagnosticSummary();
+      throw new RuntimeException("stderr was empty");
+    }
+  }
+
+    /**
    * Verify that the stdout and stderr contents of output buffer contains the string
    *
    * @param expectedString String that buffer should contain
@@ -365,4 +419,18 @@
   public int getExitValue() {
     return exitValue;
   }
+
+  /**
+   * Get the contents of the output buffer (stdout and stderr) as list of strings.
+   * Output will be split by newlines.
+   *
+   * @return Contents of the output buffer as list of strings
+   */
+  public List<String> asLines() {
+    return asLines(getOutput());
+  }
+
+  private List<String> asLines(String buffer) {
+    return Arrays.asList(buffer.split("(\\r\\n|\\n|\\r)"));
+  }
 }

--- a/hotspot/test/testlibrary/com/oracle/java/testlibrary/ProcessTools.java	Fri Jan 30 09:32:23 2015 +0100
+++ b/hotspot/test/testlibrary/com/oracle/java/testlibrary/ProcessTools.java	Fri Jan 30 20:20:11 2015 +0100
@@ -184,23 +184,36 @@
     return executeProcess(pb);
   }
 
-  /**
-   * Executes a process, waits for it to finish and returns the process output.
-   * @param pb The ProcessBuilder to execute.
-   * @return The output from the process.
-   */
-  public static OutputAnalyzer executeProcess(ProcessBuilder pb) throws Throwable {
-    OutputAnalyzer output = null;
-    try {
-      output = new OutputAnalyzer(pb.start());
-      return output;
-    } catch (Throwable t) {
-      System.out.println("executeProcess() failed: " + t);
-      throw t;
-    } finally {
-      System.out.println(getProcessLog(pb, output));
+    /**
+     * Executes a process, waits for it to finish and returns the process output.
+     * The process will have exited before this method returns.
+     * @param pb The ProcessBuilder to execute.
+     * @return The {@linkplain OutputAnalyzer} instance wrapping the process.
+     */
+    public static OutputAnalyzer executeProcess(ProcessBuilder pb) throws Exception {
+        OutputAnalyzer output = null;
+        Process p = null;
+        boolean failed = false;
+        try {
+            p = pb.start();
+            output = new OutputAnalyzer(p);
+            p.waitFor();
+
+            return output;
+        } catch (Throwable t) {
+            if (p != null) {
+                p.destroyForcibly().waitFor();
+            }
+
+            failed = true;
+            System.out.println("executeProcess() failed: " + t);
+            throw t;
+        } finally {
+            if (failed) {
+                System.err.println(getProcessLog(pb, output));
+            }
+        }
     }
-  }
 
   /**
    * Executes a process, waits for it to finish and returns the process output.