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Copyright (c) 2004-2011 All rights reserved. Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
package org.slf4j.helpers;

An internal utility class.

Alexander Dorokhine
Ceki Gülcü
public final class Util {
    private Util() {

In order to call java.lang.SecurityManager.getClassContext(), which is a protected method, we add this wrapper which allows the method to be visible inside this package.
    private static final class ClassContextSecurityManager extends SecurityManager {
        protected Class<?>[] getClassContext() {
            return super.getClassContext();
    private static final ClassContextSecurityManager SECURITY_MANAGER = new ClassContextSecurityManager();

Returns the name of the class which called the invoking method.

the name of the class which called the invoking method.
    public static Class<?> getCallingClass() {
        Class<?>[] trace = .getClassContext();
        String thisClassName = Util.class.getName();
        // Advance until Util is found
        int i;
        for (i = 0; i < trace.lengthi++) {
            if (thisClassName.equals(trace[i].getName()))
        // trace[i] = Util; trace[i+1] = caller; trace[i+2] = caller's caller
        if (i >= trace.length || i + 2 >= trace.length) {
            throw new IllegalStateException("Failed to find org.slf4j.helpers.Util or its caller in the stack; " + "this should not happen");
        return trace[i + 2];
    static final public void report(String msgThrowable t) {
        ..println("Reported exception:");
    static final public void report(String msg) {
        ..println("SLF4J: " + msg);
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