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

classpath/java/lang/Long.java

@@ -0,0 +1,13 @@
+package java.lang;
+
+public class Long {
+  private final long value;
+
+  public Long(long value) {
+    this.value = value;
+  }
+
+  public long longValue() {
+    return value;
+  }
+}