print Short Stack Trace - Java java.lang

Java examples for java.lang:Throwable

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Description

print Short Stack Trace

Demo Code

/**/*from   www . j  a v a 2  s .c o  m*/
 * Copyright (c) 2002-2013 "Neo Technology,"
 * Network Engine for Objects in Lund AB [http://neotechnology.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j 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 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 */
//package com.java2s;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringReader;
import java.io.StringWriter;

public class Main {
    public static void printShortStackTrace(Throwable cause,
            int maxNumberOfStackLines) {
        StringWriter stringWriter = new StringWriter();
        PrintWriter writer = new PrintWriter(stringWriter);
        cause.printStackTrace(writer);
        writer.close();
        String string = stringWriter.getBuffer().toString();
        System.out.println(firstLinesOf(string, maxNumberOfStackLines + 1));
    }

    public static String firstLinesOf(String string, int maxNumberOfLines) {
        // Totally verbose implementation of this functionality :)
        StringWriter stringWriter = new StringWriter();
        PrintWriter writer = new PrintWriter(stringWriter);
        try {
            BufferedReader reader = new BufferedReader(new StringReader(
                    string));
            String line = null;
            for (int count = 0; (line = reader.readLine()) != null
                    && count < maxNumberOfLines; count++) {
                writer.println(line);
            }
            writer.close();
            return stringWriter.getBuffer().toString();
        } catch (IOException e) {
            throw new RuntimeException("Can't happen", e);
        }
    }
}

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