2002-05-24 12:40:47 +02:00
|
|
|
/* java.lang.Throwable -- Reference implementation of root class for
|
|
|
|
all Exceptions and Errors
|
|
|
|
Copyright (C) 1998, 1999, 2002 Free Software Foundation, Inc.
|
1999-04-07 16:42:40 +02:00
|
|
|
|
2002-05-24 12:40:47 +02:00
|
|
|
This file is part of GNU Classpath.
|
1999-04-07 16:42:40 +02:00
|
|
|
|
2002-05-24 12:40:47 +02:00
|
|
|
GNU Classpath is free software; you can redistribute it and/or modify
|
|
|
|
it under the terms of the GNU General Public License as published by
|
|
|
|
the Free Software Foundation; either version 2, or (at your option)
|
|
|
|
any later version.
|
1999-04-07 16:42:40 +02:00
|
|
|
|
2002-05-24 12:40:47 +02:00
|
|
|
GNU Classpath is distributed in the hope that it will be useful, but
|
|
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
|
|
General Public License for more details.
|
|
|
|
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
|
|
along with GNU Classpath; see the file COPYING. If not, write to the
|
|
|
|
Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
|
|
02111-1307 USA.
|
|
|
|
|
|
|
|
Linking this library statically or dynamically with other modules is
|
|
|
|
making a combined work based on this library. Thus, the terms and
|
|
|
|
conditions of the GNU General Public License cover the whole
|
|
|
|
combination.
|
|
|
|
|
|
|
|
As a special exception, the copyright holders of this library give you
|
|
|
|
permission to link this library with independent modules to produce an
|
|
|
|
executable, regardless of the license terms of these independent
|
|
|
|
modules, and to copy and distribute the resulting executable under
|
|
|
|
terms of your choice, provided that you also meet, for each linked
|
|
|
|
independent module, the terms and conditions of the license of that
|
|
|
|
module. An independent module is a module which is not derived from
|
|
|
|
or based on this library. If you modify this library, you may extend
|
|
|
|
this exception to your version of the library, but you are not
|
|
|
|
obligated to do so. If you do not wish to do so, delete this
|
|
|
|
exception statement from your version. */
|
1999-04-07 16:42:40 +02:00
|
|
|
|
|
|
|
package java.lang;
|
2002-05-24 12:40:47 +02:00
|
|
|
|
1999-04-07 16:42:40 +02:00
|
|
|
import java.io.Serializable;
|
2002-05-24 12:40:47 +02:00
|
|
|
import java.io.PrintWriter;
|
|
|
|
import java.io.PrintStream;
|
|
|
|
import java.io.ObjectOutputStream;
|
|
|
|
import java.io.ObjectInputStream;
|
2000-02-04 17:59:35 +01:00
|
|
|
import java.io.IOException;
|
2002-05-24 12:40:47 +02:00
|
|
|
import java.io.OutputStream;
|
1999-04-07 16:42:40 +02:00
|
|
|
|
|
|
|
/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
|
|
|
|
* "The Java Language Specification", ISBN 0-201-63451-1
|
|
|
|
* Status: Sufficient for compiled code, but methods applicable to
|
|
|
|
* bytecode not implemented. JDK 1.1.
|
|
|
|
*/
|
|
|
|
|
2002-05-24 12:40:47 +02:00
|
|
|
/**
|
|
|
|
* Throwable is the superclass of all exceptions that can be raised.
|
|
|
|
*
|
|
|
|
* <p>There are two special cases: {@link Error} and {@link RuntimeException}:
|
|
|
|
* these two classes (and their subclasses) are considered unchecked
|
|
|
|
* exceptions, and are either frequent enough or catastrophic enough that you
|
|
|
|
* do not need to declare them in <code>throws</code> clauses. Everything
|
|
|
|
* else is a checked exception, and is ususally a subclass of
|
|
|
|
* {@link Exception}; these exceptions have to be handled or declared.
|
|
|
|
*
|
|
|
|
* <p>Instances of this class are usually created with knowledge of the
|
|
|
|
* execution context, so that you can get a stack trace of the problem spot
|
|
|
|
* in the code. Also, since JDK 1.4, Throwables participate in "exception
|
|
|
|
* chaining." This means that one exception can be caused by another, and
|
|
|
|
* preserve the information of the original.
|
|
|
|
*
|
|
|
|
* <p>One reason this is useful is to wrap exceptions to conform to an
|
|
|
|
* interface. For example, it would be bad design to require all levels
|
|
|
|
* of a program interface to be aware of the low-level exceptions thrown
|
|
|
|
* at one level of abstraction. Another example is wrapping a checked
|
|
|
|
* exception in an unchecked one, to communicate that failure occured
|
|
|
|
* while still obeying the method throws clause of a superclass.
|
|
|
|
*
|
|
|
|
* <p>A cause is assigned in one of two ways; but can only be assigned once
|
|
|
|
* in the lifetime of the Throwable. There are new constructors added to
|
|
|
|
* several classes in the exception hierarchy that directly initialize the
|
|
|
|
* cause, or you can use the <code>initCause</code> method. This second
|
|
|
|
* method is especially useful if the superclass has not been retrofitted
|
|
|
|
* with new constructors:<br>
|
|
|
|
* <pre>
|
|
|
|
* try
|
|
|
|
* {
|
|
|
|
* lowLevelOp();
|
|
|
|
* }
|
|
|
|
* catch (LowLevelException lle)
|
|
|
|
* {
|
|
|
|
* throw (HighLevelException) new HighLevelException().initCause(lle);
|
|
|
|
* }
|
|
|
|
* </pre>
|
|
|
|
* Notice the cast in the above example; without it, your method would need
|
|
|
|
* a throws clase that declared Throwable, defeating the purpose of chainig
|
|
|
|
* your exceptions.
|
|
|
|
*
|
|
|
|
* <p>By convention, exception classes have two constructors: one with no
|
|
|
|
* arguments, and one that takes a String for a detail message. Further,
|
|
|
|
* classes which are likely to be used in an exception chain also provide
|
|
|
|
* a constructor that takes a Throwable, with or without a detail message
|
|
|
|
* string.
|
|
|
|
*
|
|
|
|
* <p>Another 1.4 feature is the StackTrace, a means of reflection that
|
|
|
|
* allows the program to inspect the context of the exception, and which is
|
|
|
|
* serialized, so that remote procedure calls can correctly pass exceptions.
|
|
|
|
*
|
|
|
|
* @author Brian Jones
|
|
|
|
* @author John Keiser
|
|
|
|
* @author Mark Wielaard
|
|
|
|
* @author Tom Tromey
|
|
|
|
* @author Eric Blake <ebb9@email.byu.edu>
|
|
|
|
* @since 1.0
|
2002-08-25 00:46:19 +02:00
|
|
|
* @status updated to 1.4
|
2002-05-24 12:40:47 +02:00
|
|
|
*/
|
1999-04-07 16:42:40 +02:00
|
|
|
public class Throwable implements Serializable
|
|
|
|
{
|
2002-05-24 12:40:47 +02:00
|
|
|
/**
|
|
|
|
* Compatible with JDK 1.0+.
|
|
|
|
*/
|
|
|
|
private static final long serialVersionUID = -3042686055658047285L;
|
|
|
|
|
|
|
|
/**
|
|
|
|
* The detail message.
|
|
|
|
*
|
|
|
|
* @serial specific details about the exception, may be null
|
|
|
|
*/
|
2002-08-25 00:46:19 +02:00
|
|
|
private final String detailMessage;
|
2002-05-24 12:40:47 +02:00
|
|
|
|
|
|
|
/**
|
|
|
|
* The cause of the throwable, including null for an unknown or non-chained
|
|
|
|
* cause. This may only be set once; so the field is set to
|
|
|
|
* <code>this</code> until initialized.
|
|
|
|
*
|
|
|
|
* @serial the cause, or null if unknown, or this if not yet set
|
|
|
|
* @since 1.4
|
|
|
|
*/
|
|
|
|
private Throwable cause = this;
|
|
|
|
|
|
|
|
/**
|
|
|
|
* The stack trace, in a serialized form.
|
|
|
|
*
|
|
|
|
* @serial the elements of the stack trace; this is non-null, and has
|
|
|
|
* no null entries
|
|
|
|
* @since 1.4
|
|
|
|
*/
|
2002-07-12 14:52:44 +02:00
|
|
|
private StackTraceElement[] stackTrace;
|
2002-05-24 12:40:47 +02:00
|
|
|
|
|
|
|
/**
|
|
|
|
* Instantiate this Throwable with an empty message. The cause remains
|
|
|
|
* uninitialized. {@link #fillInStackTrace()} will be called to set
|
|
|
|
* up the stack trace.
|
|
|
|
*/
|
|
|
|
public Throwable()
|
|
|
|
{
|
|
|
|
this((String) null);
|
|
|
|
}
|
1999-04-07 16:42:40 +02:00
|
|
|
|
2002-05-24 12:40:47 +02:00
|
|
|
/**
|
|
|
|
* Instantiate this Throwable with the given message. The cause remains
|
|
|
|
* uninitialized. {@link #fillInStackTrace()} will be called to set
|
|
|
|
* up the stack trace.
|
|
|
|
*
|
|
|
|
* @param message the message to associate with the Throwable
|
|
|
|
*/
|
|
|
|
public Throwable(String message)
|
2000-01-17 16:45:24 +01:00
|
|
|
{
|
2002-05-24 12:40:47 +02:00
|
|
|
fillInStackTrace();
|
|
|
|
detailMessage = message;
|
2000-01-17 16:45:24 +01:00
|
|
|
}
|
1999-04-07 16:42:40 +02:00
|
|
|
|
2002-05-24 12:40:47 +02:00
|
|
|
/**
|
|
|
|
* Instantiate this Throwable with the given message and cause. Note that
|
|
|
|
* the message is unrelated to the message of the cause.
|
|
|
|
* {@link #fillInStackTrace()} will be called to set up the stack trace.
|
|
|
|
*
|
|
|
|
* @param message the message to associate with the Throwable
|
|
|
|
* @param cause the cause, may be null
|
|
|
|
* @since 1.4
|
|
|
|
*/
|
|
|
|
public Throwable(String message, Throwable cause)
|
|
|
|
{
|
|
|
|
this(message);
|
|
|
|
initCause(cause);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Instantiate this Throwable with the given cause. The message is then
|
|
|
|
* built as <code>cause == null ? null : cause.toString()</code>.
|
|
|
|
* {@link #fillInStackTrace()} will be called to set up the stack trace.
|
|
|
|
*
|
|
|
|
* @param cause the cause, may be null
|
|
|
|
* @since 1.4
|
|
|
|
*/
|
|
|
|
public Throwable(Throwable cause)
|
|
|
|
{
|
|
|
|
this(cause == null ? null : cause.toString(), cause);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Get the message associated with this Throwable.
|
|
|
|
*
|
|
|
|
* @return the error message associated with this Throwable, may be null
|
|
|
|
*/
|
|
|
|
public String getMessage()
|
2000-01-17 16:45:24 +01:00
|
|
|
{
|
|
|
|
return detailMessage;
|
|
|
|
}
|
1999-04-07 16:42:40 +02:00
|
|
|
|
2002-05-24 12:40:47 +02:00
|
|
|
/**
|
|
|
|
* Get a localized version of this Throwable's error message.
|
|
|
|
* This method must be overridden in a subclass of Throwable
|
|
|
|
* to actually produce locale-specific methods. The Throwable
|
|
|
|
* implementation just returns getMessage().
|
|
|
|
*
|
|
|
|
* @return a localized version of this error message
|
|
|
|
* @see #getMessage()
|
|
|
|
* @since 1.1
|
|
|
|
*/
|
|
|
|
public String getLocalizedMessage()
|
|
|
|
{
|
|
|
|
return getMessage();
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Returns the cause of this exception, or null if the cause is not known
|
|
|
|
* or non-existant. This cause is initialized by the new constructors,
|
|
|
|
* or by calling initCause.
|
|
|
|
*
|
|
|
|
* @return the cause of this Throwable
|
|
|
|
* @since 1.4
|
|
|
|
*/
|
|
|
|
public Throwable getCause()
|
2000-01-17 16:45:24 +01:00
|
|
|
{
|
2002-05-24 12:40:47 +02:00
|
|
|
return cause == this ? null : cause;
|
2000-01-17 16:45:24 +01:00
|
|
|
}
|
|
|
|
|
2002-05-24 12:40:47 +02:00
|
|
|
/**
|
|
|
|
* Initialize the cause of this Throwable. This may only be called once
|
|
|
|
* during the object lifetime, including implicitly by chaining
|
|
|
|
* constructors.
|
|
|
|
*
|
|
|
|
* @param cause the cause of this Throwable, may be null
|
|
|
|
* @return this
|
|
|
|
* @throws IllegalArgumentException if cause is this (a Throwable can't be
|
|
|
|
* its own cause!)
|
|
|
|
* @throws IllegalStateException if the cause has already been set
|
|
|
|
* @since 1.4
|
|
|
|
*/
|
|
|
|
public Throwable initCause(Throwable cause)
|
2000-01-17 16:45:24 +01:00
|
|
|
{
|
2002-05-24 12:40:47 +02:00
|
|
|
if (cause == this)
|
|
|
|
throw new IllegalArgumentException();
|
|
|
|
if (this.cause != this)
|
|
|
|
throw new IllegalStateException();
|
|
|
|
this.cause = cause;
|
|
|
|
return this;
|
2000-01-17 16:45:24 +01:00
|
|
|
}
|
2000-02-04 17:59:35 +01:00
|
|
|
|
2002-05-24 12:40:47 +02:00
|
|
|
/**
|
|
|
|
* Get a human-readable representation of this Throwable. The detail message
|
|
|
|
* is retrieved by getLocalizedMessage(). Then, with a null detail
|
|
|
|
* message, this string is simply the object's class name; otherwise
|
|
|
|
* the string is <code>getClass().getName() + ": " + message</code>.
|
|
|
|
*
|
|
|
|
* @return a human-readable String represting this Throwable
|
|
|
|
*/
|
|
|
|
public String toString()
|
|
|
|
{
|
|
|
|
String msg = getLocalizedMessage();
|
|
|
|
return getClass().getName() + (msg == null ? "" : ": " + msg);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Print a stack trace to the standard error stream. This stream is the
|
|
|
|
* current contents of <code>System.err</code>. The first line of output
|
|
|
|
* is the result of {@link #toString()}, and the remaining lines represent
|
|
|
|
* the data created by {@link #fillInStackTrace()}. While the format is
|
|
|
|
* unspecified, this implementation uses the suggested format, demonstrated
|
|
|
|
* by this example:<br>
|
|
|
|
* <pre>
|
|
|
|
* public class Junk
|
|
|
|
* {
|
|
|
|
* public static void main(String args[])
|
|
|
|
* {
|
|
|
|
* try
|
|
|
|
* {
|
|
|
|
* a();
|
|
|
|
* }
|
|
|
|
* catch(HighLevelException e)
|
|
|
|
* {
|
|
|
|
* e.printStackTrace();
|
|
|
|
* }
|
|
|
|
* }
|
|
|
|
* static void a() throws HighLevelException
|
|
|
|
* {
|
|
|
|
* try
|
|
|
|
* {
|
|
|
|
* b();
|
|
|
|
* }
|
|
|
|
* catch(MidLevelException e)
|
|
|
|
* {
|
|
|
|
* throw new HighLevelException(e);
|
|
|
|
* }
|
|
|
|
* }
|
|
|
|
* static void b() throws MidLevelException
|
|
|
|
* {
|
|
|
|
* c();
|
|
|
|
* }
|
|
|
|
* static void c() throws MidLevelException
|
|
|
|
* {
|
|
|
|
* try
|
|
|
|
* {
|
|
|
|
* d();
|
|
|
|
* }
|
|
|
|
* catch(LowLevelException e)
|
|
|
|
* {
|
|
|
|
* throw new MidLevelException(e);
|
|
|
|
* }
|
|
|
|
* }
|
|
|
|
* static void d() throws LowLevelException
|
|
|
|
* {
|
|
|
|
* e();
|
|
|
|
* }
|
|
|
|
* static void e() throws LowLevelException
|
|
|
|
* {
|
|
|
|
* throw new LowLevelException();
|
|
|
|
* }
|
|
|
|
* }
|
|
|
|
* class HighLevelException extends Exception
|
|
|
|
* {
|
|
|
|
* HighLevelException(Throwable cause) { super(cause); }
|
|
|
|
* }
|
|
|
|
* class MidLevelException extends Exception
|
|
|
|
* {
|
|
|
|
* MidLevelException(Throwable cause) { super(cause); }
|
|
|
|
* }
|
|
|
|
* class LowLevelException extends Exception
|
|
|
|
* {
|
|
|
|
* }
|
|
|
|
* </pre>
|
|
|
|
* <p>
|
|
|
|
* <pre>
|
|
|
|
* HighLevelException: MidLevelException: LowLevelException
|
|
|
|
* at Junk.a(Junk.java:13)
|
|
|
|
* at Junk.main(Junk.java:4)
|
|
|
|
* Caused by: MidLevelException: LowLevelException
|
|
|
|
* at Junk.c(Junk.java:23)
|
|
|
|
* at Junk.b(Junk.java:17)
|
|
|
|
* at Junk.a(Junk.java:11)
|
|
|
|
* ... 1 more
|
|
|
|
* Caused by: LowLevelException
|
|
|
|
* at Junk.e(Junk.java:30)
|
|
|
|
* at Junk.d(Junk.java:27)
|
|
|
|
* at Junk.c(Junk.java:21)
|
|
|
|
* ... 3 more
|
|
|
|
* </pre>
|
|
|
|
*/
|
|
|
|
public void printStackTrace()
|
|
|
|
{
|
|
|
|
printStackTrace(System.err);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Print a stack trace to the specified PrintStream. See
|
|
|
|
* {@link #printStackTrace()} for the sample format.
|
|
|
|
*
|
|
|
|
* @param s the PrintStream to write the trace to
|
|
|
|
*/
|
|
|
|
public void printStackTrace(PrintStream s)
|
|
|
|
{
|
2002-08-25 00:46:19 +02:00
|
|
|
s.print(stackTraceString());
|
2002-05-24 12:40:47 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
2002-07-12 14:52:44 +02:00
|
|
|
* <p>Prints the exception, the detailed message and the stack trace
|
|
|
|
* associated with this Throwable to the given <code>PrintWriter</code>.
|
|
|
|
* The actual output written is implemention specific. Use the result of
|
|
|
|
* <code>getStackTrace()</code> when more precise information is needed.
|
|
|
|
*
|
|
|
|
* <p>This implementation first prints a line with the result of this
|
|
|
|
* object's <code>toString()</code> method.
|
|
|
|
* <br>
|
|
|
|
* Then for all elements given by <code>getStackTrace</code> it prints
|
|
|
|
* a line containing three spaces, the string "at " and the result of calling
|
|
|
|
* the <code>toString()</code> method on the <code>StackTraceElement</code>
|
|
|
|
* object. If <code>getStackTrace()</code> returns an empty array it prints
|
|
|
|
* a line containing three spaces and the string
|
|
|
|
* "<<No stacktrace available>>".
|
|
|
|
* <br>
|
|
|
|
* Then if <code>getCause()</code> doesn't return null it adds a line
|
|
|
|
* starting with "Caused by: " and the result of calling
|
|
|
|
* <code>toString()</code> on the cause.
|
|
|
|
* <br>
|
|
|
|
* Then for every cause (of a cause, etc) the stacktrace is printed the
|
|
|
|
* same as for the top level <code>Throwable</code> except that as soon
|
|
|
|
* as all the remaining stack frames of the cause are the same as the
|
|
|
|
* the last stack frames of the throwable that the cause is wrapped in
|
|
|
|
* then a line starting with three spaces and the string "... X more" is
|
|
|
|
* printed, where X is the number of remaining stackframes.
|
2002-05-24 12:40:47 +02:00
|
|
|
*
|
|
|
|
* @param w the PrintWriter to write the trace to
|
|
|
|
* @since 1.1
|
|
|
|
*/
|
2002-07-12 14:52:44 +02:00
|
|
|
public void printStackTrace (PrintWriter pw)
|
2000-02-04 17:59:35 +01:00
|
|
|
{
|
2002-08-25 00:46:19 +02:00
|
|
|
pw.print(stackTraceString());
|
|
|
|
}
|
2002-07-12 14:52:44 +02:00
|
|
|
|
2002-08-25 00:46:19 +02:00
|
|
|
private static final String nl = System.getProperty("line.separator");
|
|
|
|
// Create whole stack trace in a stringbuffer so we don't have to print
|
|
|
|
// it line by line. This prevents printing multiple stack traces from
|
|
|
|
// different threads to get mixed up when written to the same PrintWriter.
|
|
|
|
private String stackTraceString()
|
|
|
|
{
|
|
|
|
StringBuffer sb = new StringBuffer();
|
|
|
|
|
|
|
|
// Main stacktrace
|
2002-07-12 14:52:44 +02:00
|
|
|
StackTraceElement[] stack = getStackTrace();
|
2002-08-25 00:46:19 +02:00
|
|
|
stackTraceStringBuffer(sb, this.toString(), stack, 0);
|
2002-07-12 14:52:44 +02:00
|
|
|
|
|
|
|
// The cause(s)
|
|
|
|
Throwable cause = getCause();
|
|
|
|
while (cause != null)
|
2000-02-04 17:59:35 +01:00
|
|
|
{
|
2002-08-25 00:46:19 +02:00
|
|
|
// Cause start first line
|
|
|
|
sb.append("Caused by: ");
|
2002-07-12 14:52:44 +02:00
|
|
|
|
|
|
|
// Cause stacktrace
|
|
|
|
StackTraceElement[] parentStack = stack;
|
|
|
|
stack = cause.getStackTrace();
|
2002-08-25 00:46:19 +02:00
|
|
|
if (parentStack == null || parentStack.length == 0)
|
|
|
|
stackTraceStringBuffer(sb, cause.toString(), stack, 0);
|
2002-07-12 14:52:44 +02:00
|
|
|
else
|
|
|
|
{
|
2002-08-25 00:46:19 +02:00
|
|
|
int equal = 0; // Count how many of the last stack frames are equal
|
|
|
|
int frame = stack.length-1;
|
|
|
|
int parentFrame = parentStack.length-1;
|
|
|
|
while (frame > 0 && parentFrame > 0)
|
2002-07-12 14:52:44 +02:00
|
|
|
{
|
2002-08-25 00:46:19 +02:00
|
|
|
if (stack[frame].equals(parentStack[parentFrame]))
|
2002-07-12 14:52:44 +02:00
|
|
|
{
|
2002-08-25 00:46:19 +02:00
|
|
|
equal++;
|
|
|
|
frame--;
|
|
|
|
parentFrame--;
|
2002-07-12 14:52:44 +02:00
|
|
|
}
|
|
|
|
else
|
2002-08-25 00:46:19 +02:00
|
|
|
break;
|
2002-07-12 14:52:44 +02:00
|
|
|
}
|
2002-08-25 00:46:19 +02:00
|
|
|
stackTraceStringBuffer(sb, cause.toString(), stack, equal);
|
2002-07-12 14:52:44 +02:00
|
|
|
}
|
|
|
|
cause = cause.getCause();
|
2000-02-04 17:59:35 +01:00
|
|
|
}
|
2002-08-25 00:46:19 +02:00
|
|
|
|
|
|
|
return sb.toString();
|
|
|
|
}
|
|
|
|
|
|
|
|
// Adds to the given StringBuffer a line containing the name and
|
|
|
|
// all stacktrace elements minus the last equal ones.
|
|
|
|
private static void stackTraceStringBuffer(StringBuffer sb, String name,
|
|
|
|
StackTraceElement[] stack, int equal)
|
|
|
|
{
|
|
|
|
// (finish) first line
|
|
|
|
sb.append(name);
|
|
|
|
sb.append(nl);
|
|
|
|
|
|
|
|
// The stacktrace
|
|
|
|
if (stack == null || stack.length == 0)
|
|
|
|
{
|
|
|
|
sb.append(" <<No stacktrace available>>");
|
|
|
|
sb.append(nl);
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
for (int i = 0; i < stack.length-equal; i++)
|
|
|
|
{
|
|
|
|
sb.append(" at ");
|
|
|
|
sb.append(stack[i] == null ? "<<Unknown>>" : stack[i].toString());
|
|
|
|
sb.append(nl);
|
|
|
|
}
|
|
|
|
if (equal > 0)
|
|
|
|
{
|
|
|
|
sb.append(" ...");
|
|
|
|
sb.append(equal);
|
|
|
|
sb.append(" more");
|
|
|
|
sb.append(nl);
|
|
|
|
}
|
|
|
|
}
|
2000-02-04 17:59:35 +01:00
|
|
|
}
|
|
|
|
|
2002-05-24 12:40:47 +02:00
|
|
|
/**
|
|
|
|
* Fill in the stack trace with the current execution stack.
|
|
|
|
*
|
|
|
|
* @return this same throwable
|
|
|
|
* @see #printStackTrace()
|
|
|
|
*/
|
2002-08-25 00:46:19 +02:00
|
|
|
public Throwable fillInStackTrace()
|
|
|
|
{
|
|
|
|
vmState = VMThrowable.fillInStackTrace(this);
|
|
|
|
stackTrace = null; // Should be regenerated when used.
|
|
|
|
|
|
|
|
return this;
|
|
|
|
}
|
1999-04-07 16:42:40 +02:00
|
|
|
|
2002-05-24 12:40:47 +02:00
|
|
|
/**
|
|
|
|
* Provides access to the information printed in {@link #printStackTrace()}.
|
|
|
|
* The array is non-null, with no null entries, although the virtual
|
|
|
|
* machine is allowed to skip stack frames. If the array is not 0-length,
|
|
|
|
* then slot 0 holds the information on the stack frame where the Throwable
|
|
|
|
* was created (or at least where <code>fillInStackTrace()</code> was
|
|
|
|
* called).
|
|
|
|
*
|
|
|
|
* @return an array of stack trace information, as available from the VM
|
|
|
|
* @since 1.4
|
|
|
|
*/
|
|
|
|
public StackTraceElement[] getStackTrace()
|
2000-01-17 16:45:24 +01:00
|
|
|
{
|
2002-07-12 14:52:44 +02:00
|
|
|
if (stackTrace == null)
|
2002-08-25 00:46:19 +02:00
|
|
|
if (vmState == null)
|
|
|
|
stackTrace = new StackTraceElement[0];
|
|
|
|
else
|
|
|
|
{
|
|
|
|
stackTrace = vmState.getStackTrace(this);
|
|
|
|
vmState = null; // No longer needed
|
|
|
|
}
|
2002-07-12 14:52:44 +02:00
|
|
|
|
2002-05-24 12:40:47 +02:00
|
|
|
return stackTrace;
|
2000-01-17 16:45:24 +01:00
|
|
|
}
|
1999-04-07 16:42:40 +02:00
|
|
|
|
2002-05-24 12:40:47 +02:00
|
|
|
/**
|
|
|
|
* Change the stack trace manually. This method is designed for remote
|
|
|
|
* procedure calls, which intend to alter the stack trace before or after
|
|
|
|
* serialization according to the context of the remote call.
|
2002-08-25 00:46:19 +02:00
|
|
|
* <p>
|
|
|
|
* The contents of the given stacktrace is copied so changes to the
|
|
|
|
* original * array do not change the stack trace elements of this
|
|
|
|
* throwable.
|
2002-05-24 12:40:47 +02:00
|
|
|
*
|
|
|
|
* @param stackTrace the new trace to use
|
|
|
|
* @throws NullPointerException if stackTrace is null or has null elements
|
|
|
|
* @since 1.4
|
|
|
|
*/
|
|
|
|
public void setStackTrace(StackTraceElement[] stackTrace)
|
2000-01-17 16:45:24 +01:00
|
|
|
{
|
2002-08-25 00:46:19 +02:00
|
|
|
int i = stackTrace.length;
|
|
|
|
StackTraceElement[] st = new StackTraceElement[i];
|
|
|
|
|
|
|
|
while (--i >= 0)
|
2002-05-24 12:40:47 +02:00
|
|
|
if (stackTrace[i] == null)
|
2002-08-25 00:46:19 +02:00
|
|
|
throw new NullPointerException();
|
|
|
|
else
|
|
|
|
st[i] = stackTrace[i];
|
1999-04-07 16:42:40 +02:00
|
|
|
|
2002-08-25 00:46:19 +02:00
|
|
|
this.stackTrace = st;
|
|
|
|
}
|
2002-07-12 14:52:44 +02:00
|
|
|
|
2002-08-25 00:46:19 +02:00
|
|
|
/**
|
|
|
|
* VM state when fillInStackTrace was called.
|
|
|
|
* Used by getStackTrace() to get an array of StackTraceElements.
|
|
|
|
* Cleared when no longer needed.
|
|
|
|
*/
|
|
|
|
private transient VMThrowable vmState;
|
1999-04-07 16:42:40 +02:00
|
|
|
}
|