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copied!<p>We solved this problem by redirecting System.err before loading the configuration and checking if errors were logged to the stream:</p> <pre><code>class ConfigurationLoader { class Log4jConfigStderrStream extends ByteArrayOutputStream { private int lineCount; private StringBuilder output; private PrintStream underlying; public Log4jConfigStderrStream(PrintStream underlying) { this.lineCount = 0; this.output = new StringBuilder(""); this.underlying = underlying; } @Override public void flush() throws IOException { String[] buffer; synchronized (this) { buffer = this.toString().split("\n"); super.flush(); super.reset(); for (int i = 0; i < buffer.length; i++) { String line = buffer[i].replace("\n", "").replace("\r", ""); if (line.length() > 0) { this.lineCount++; this.output.append(line); this.output.append("\n"); } } } } public String getOutput() { return this.output.toString(); } public PrintStream getUnderlying() { return this.underlying; } public boolean hasErrors() { return this.lineCount == 0 ? false : true; } } private String output; public void flushOutput() { if (!"".equals(this.output)) System.err.print(this.output); } public boolean loadConfiguration(String filename) { Log4jConfigStderrStream confErr; confErr = new Log4jConfigStderrStream(System.err); System.setErr(new PrintStream(confErr, true)); LogManager.resetConfiguration(); DOMConfigurator.configure(filename); System.setErr(confErr.getUnderlying()); this.output = confErr.getOutput(); return !confErr.hasErrors(); } } </code></pre>

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