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

classpath/java/lang/StackTraceElement.java

@@ -1,8 +1,39 @@
 package java.lang;
 
 public class StackTraceElement {
-  private Object method;
-  private int ip;
+  private static int NativeLine = -2;
 
-  private StackTraceElement() { }
+  private String class_;
+  private String method;
+  private String file;
+  private int line;
+
+  private StackTraceElement(String class_, String method, String file,
+                            int line)
+  {
+    this.class_ = class_;
+    this.method = method;
+    this.file = file;
+    this.line = line;
+  }
+
+  public String getClassName() {
+    return class_;
+  }
+
+  public String getMethodName() {
+    return method;
+  }
+
+  public String getFileName() {
+    return file;
+  }
+
+  public int getLineNumber() {
+    return line;
+  }
+
+  public boolean isNativeMethod() {
+    return line == NativeLine;
+  }
 }