Alexander Khokhlov created LOG4J2-581:
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Summary: No header output in RollingRandomAccessFile
Key: LOG4J2-581
URL: https://issues.apache.org/jira/browse/LOG4J2-581
Project: Log4j 2
Issue Type: Bug
Components: Appenders
Reporter: Alexander Khokhlov
No header output in RollingRandomAccessFile due to DummyOutputStream used when
creating RollingRandomAccessFileManager.
{code:title=RollingRandomAccessFileManager.java}
...
162: return new RollingRandomAccessFileManager(raf, name,
data.pattern, +new DummyOutputStream()+, data.append,
163: data.immediateFlush, size, time, data.policy,
data.strategy, data.advertiseURI, data.layout);
{code}
When the superclass constructor (OutputStreamManager) writes header, it outputs
thus header to nowhere:
{code:title=OutputStreamManager.java}
35: protected OutputStreamManager(final OutputStream os, final String
streamName, final Layout<?> layout) {
36: super(streamName);
37: this.os = os;
38: if (layout != null) {
39: this.footer = layout.getFooter();
40: this.header = layout.getHeader();
41: if (this.header != null) {
42: try {
43: this.os.write(header, 0, header.length);
44: } catch (final IOException ioe) {
45: LOGGER.error("Unable to write header", ioe);
46: }
47: }
48: } else {
49: this.footer = null;
50: this.header = null;
51: }
52: }
{code}
The same fragment from RollingFileManager.java where header output works fine:
{code:title=RollingFileManager.java}
306: os = new FileOutputStream(name, data.append);
307: if (data.bufferedIO) {
308: os = new BufferedOutputStream(os);
309: }
310: final long time = file.lastModified(); // LOG4J2-531 create
file first so time has valid value
311: return new RollingFileManager(name, data.pattern, os,
data.append, size, time, data.policy,
312: data.strategy, data.advertiseURI, data.layout);
{code}
In this case the "os" variable is a real stream which points to the file.
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