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    <p>I decided to bring my solution to everybody. Let me clarify first of all that this is not a logback issue and not a JRE problem. This is described in the <a href="http://docs.oracle.com/javase/6/docs/api/java/io/OutputStream.html#flush%28%29">javadoc</a> and generally shouldn't be an issue until you are faced with some old school integration solutions over the file syncing.</p> <p>So this is a logback appender implemented to flush immediately:</p> <pre><code>public class ImmediateFileAppender&lt;E&gt; extends RollingFileAppender&lt;E&gt; { @Override public void openFile(String file_name) throws IOException { synchronized (lock) { File file = new File(file_name); if (FileUtil.isParentDirectoryCreationRequired(file)) { boolean result = FileUtil.createMissingParentDirectories(file); if (!result) { addError("Failed to create parent directories for [" + file.getAbsolutePath() + "]"); } } ImmediateResilientFileOutputStream resilientFos = new ImmediateResilientFileOutputStream(file, append); resilientFos.setContext(context); setOutputStream(resilientFos); } } @Override protected void writeOut(E event) throws IOException { super.writeOut(event); } } </code></pre> <p>This is corresponding output stream utility class. Because of some methods and fields of original <code>ResilientOutputStreamBase</code> that was supposed for extending initially have packaged access modifiers I had to extend <code>OutputStream</code> instead and just copy the rest and unchanged of <code>ResilientOutputStreamBase</code> and <code>ResilientFileOutputStream</code> to this new one. I just display the changed code:</p> <pre><code>public class ImmediateResilientFileOutputStream extends OutputStream { // merged code from ResilientOutputStreamBase and ResilientFileOutputStream protected FileOutputStream os; public FileOutputStream openNewOutputStream() throws IOException { return new FileOutputStream(file, true); } @Override public void flush() { if (os != null) { try { os.flush(); os.getFD().sync(); // this's make sence postSuccessfulWrite(); } catch (IOException e) { postIOFailure(e); } } } } </code></pre> <p>And finally the config:</p> <pre><code>&lt;appender name="FOR_INTEGRATION" class="package.ImmediateFileAppender"&gt; &lt;file&gt;/somepath/for_integration.log&lt;/file&gt; &lt;rollingPolicy class="ch.qos.logback.core.rolling.FixedWindowRollingPolicy"&gt; &lt;fileNamePattern&gt;for_integration.log.%i&lt;/fileNamePattern&gt; &lt;minIndex&gt;1&lt;/minIndex&gt; &lt;maxIndex&gt;3&lt;/maxIndex&gt; &lt;/rollingPolicy&gt; &lt;triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy"&gt; &lt;maxFileSize&gt;5MB&lt;/maxFileSize&gt; &lt;/triggeringPolicy&gt; &lt;encoder&gt; &lt;pattern&gt;%d{HH:mm:ss.SSS} - %msg%n&lt;/pattern&gt; &lt;immediateFlush&gt;true&lt;/immediateFlush&gt; &lt;/encoder&gt; &lt;/appender&gt; </code></pre>
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