flesh out classpath enough to test threading; fix indexing bug in parsePool()

classpath/java/lang/InterruptedException.java

@@ -0,0 +1,19 @@
+package java.lang;
+
+public class InterruptedException extends Exception {
+  public InterruptedException(String message, Throwable cause) {
+    super(message, cause);
+  }
+
+  public InterruptedException(String message) {
+    this(message, null);
+  }
+
+  public InterruptedException(Throwable cause) {
+    this(null, cause);
+  }
+
+  public InterruptedException() {
+    this(null, null);
+  }
+}