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https://issues.apache.org/jira/browse/LOG4J2-581?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Remko Popma reassigned LOG4J2-581:
----------------------------------
Assignee: Remko Popma
> 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
> Affects Versions: 2.0-rc1
> Reporter: Alexander Khokhlov
> Assignee: Remko Popma
> Labels: Rollover
>
> 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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