improve TestKillRestart debugging

so we catch more output if stuff goes wrong

h2/src/test/org/h2/test/synth/OutputCatcher.java

@@ -9,7 +9,6 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.util.LinkedList;
 import java.util.concurrent.TimeUnit;
-
 import org.h2.util.IOUtils;
 
 /**
@@ -51,7 +50,8 @@ public class OutputCatcher extends Thread {
 
     @Override
     public void run() {
-        StringBuilder buff = new StringBuilder();
+        final StringBuilder buff = new StringBuilder();
+        try {
             while (true) {
                 try {
                     int x = in.read();
@@ -75,5 +75,14 @@ public class OutputCatcher extends Thread {
                 }
             }
             IOUtils.closeSilently(in);
+        } finally {
+            // just in case something goes wrong, make sure we store any partial output we got
+            if (buff.length() > 0) {
+                synchronized (list) {
+                    list.add(buff.toString());
+                    list.notifyAll();
+                }
+            }
+        }
     }
 }

h2/src/test/org/h2/test/synth/TestKillRestart.java

@@ -42,7 +42,7 @@ public class TestKillRestart extends TestBase {
 
         int len = getSize(2, 15);
         for (int i = 0; i < len; i++) {
-            Process p = Runtime.getRuntime().exec(procDef);
+            Process p = new ProcessBuilder().redirectErrorStream(true).command(procDef).start();
             InputStream in = p.getInputStream();
             OutputCatcher catcher = new OutputCatcher(in);
             catcher.start();