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https://issues.apache.org/jira/browse/LOG4J2-743?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14074099#comment-14074099
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Remko Popma commented on LOG4J2-743:
------------------------------------
Unfortunately the _packages_ attribute does not work correctly in log4j-2.0-rc2
and log4j-2.0.
(See LOG4J2-741).
As a work-around, you can build your custom plugin with Maven. When you build
with Maven, a meta-data file is created during the build and included in your
jar. Log4j will use this meta-data file to find your plugin.
> How to add a custom appender
> -----------------------------
>
> Key: LOG4J2-743
> URL: https://issues.apache.org/jira/browse/LOG4J2-743
> Project: Log4j 2
> Issue Type: Question
> Components: Appenders
> Affects Versions: 2.0
> Environment: Windows Server 2003,jdk1.6.0_43,Eclipse Kepler Service
> Release 1
> Reporter: Zhou Tuo
> Labels: appender, custom
>
> I was writing a log system in my project with log4j2.I want output logs into
> memory. I write a MemoryAppender referring to the manual of log4j2,but an
> error occured when starting the application.
> I doubt that my custom appender doesn't exist in Log4j2Plugin.dat ?
> In the log4j-2.0-rc1,I found PluginManager class,containing a main method
> which can generate binary file Log4j2Plugin.dat, but this method is
> deprecated in the latest version.I wonder if there is another way to do this ?
> Log
> {code}
> 2014-07-25 09:25:43,052 DEBUG Starting configuration
> XmlConfiguration[location=D:\gitlab\project\src\main\webapp\WEB-INF\classes\log4j2.xml]
> 2014-07-25 09:25:43,052 DEBUG Found Plugin Map at
> jar:file:/D:/gitlab/project/lib/log4j-core-2.0.jar!/META-INF/org/apache/logging/log4j/core/config/plugins/Log4j2Plugins.dat
> 2014-07-25 09:25:43,052 ERROR Error processing element Memory: CLASS_NOT_FOUND
> 2014-07-25 09:25:43,068 DEBUG Building Plugin[name=appenders,
> class=org.apache.logging.log4j.core.config.AppendersPlugin]. Searching for
> builder factory method...
> 2014-07-25 09:25:43,068 DEBUG No builder factory method found in class
> org.apache.logging.log4j.core.config.AppendersPlugin. Going to try finding a
> factory method instead.
> 2014-07-25 09:25:43,068 DEBUG Still building Plugin[name=appenders,
> class=org.apache.logging.log4j.core.config.AppendersPlugin]. Searching for
> factory method...
> 2014-07-25 09:25:43,068 DEBUG Found factory method [createAppenders]: public
> static java.util.concurrent.ConcurrentMap
> org.apache.logging.log4j.core.config.AppendersPlugin.createAppenders(org.apache.logging.log4j.core.Appender[]).
> 2014-07-25 09:25:43,068 DEBUG Calling createAppenders on class
> org.apache.logging.log4j.core.config.AppendersPlugin for element Appenders
> with params(={})
> 2014-07-25 09:25:43,068 DEBUG Built Plugin[name=appenders] OK from factory
> method.
> 2014-07-25 09:25:43,068 DEBUG Building Plugin[name=AppenderRef,
> class=org.apache.logging.log4j.core.config.AppenderRef]. Searching for
> builder factory method...
> 2014-07-25 09:25:43,068 DEBUG No builder factory method found in class
> org.apache.logging.log4j.core.config.AppenderRef. Going to try finding a
> factory method instead.
> 2014-07-25 09:25:43,068 DEBUG Still building Plugin[name=AppenderRef,
> class=org.apache.logging.log4j.core.config.AppenderRef]. Searching for
> factory method...
> 2014-07-25 09:25:43,068 DEBUG Found factory method [createAppenderRef]:
> public static org.apache.logging.log4j.core.config.AppenderRef
> org.apache.logging.log4j.core.config.AppenderRef.createAppenderRef(java.lang.String,org.apache.logging.log4j.Level,org.apache.logging.log4j.core.Filter).
> 2014-07-25 09:25:43,084 DEBUG Calling createAppenderRef on class
> org.apache.logging.log4j.core.config.AppenderRef for element AppenderRef with
> params(ref="Memory", level="null", null)
> 2014-07-25 09:25:43,084 DEBUG Built Plugin[name=AppenderRef] OK from factory
> method.
> 2014-07-25 09:25:43,084 DEBUG Building Plugin[name=root,
> class=org.apache.logging.log4j.core.config.LoggerConfig$RootLogger].
> Searching for builder factory method...
> 2014-07-25 09:25:43,084 DEBUG No builder factory method found in class
> org.apache.logging.log4j.core.config.LoggerConfig$RootLogger. Going to try
> finding a factory method instead.
> 2014-07-25 09:25:43,084 DEBUG Still building Plugin[name=root,
> class=org.apache.logging.log4j.core.config.LoggerConfig$RootLogger].
> Searching for factory method...
> 2014-07-25 09:25:43,084 DEBUG Found factory method [createLogger]: public
> static org.apache.logging.log4j.core.config.LoggerConfig
> org.apache.logging.log4j.core.config.LoggerConfig$RootLogger.createLogger(java.lang.String,org.apache.logging.log4j.Level,java.lang.String,org.apache.logging.log4j.core.config.AppenderRef[],org.apache.logging.log4j.core.config.Property[],org.apache.logging.log4j.core.config.Configuration,org.apache.logging.log4j.core.Filter).
> 2014-07-25 09:25:43,099 DEBUG Calling createLogger on class
> org.apache.logging.log4j.core.config.LoggerConfig$RootLogger for element Root
> with params(additivity="null", level="INFO", includeLocation="null",
> ={Memory}, ={},
> Configuration(D:\gitlab\project\src\main\webapp\WEB-INF\classes\log4j2.xml),
> null)
> 2014-07-25 09:25:43,099 DEBUG Built Plugin[name=root] OK from factory method.
> 2014-07-25 09:25:43,099 DEBUG Building Plugin[name=loggers,
> class=org.apache.logging.log4j.core.config.LoggersPlugin]. Searching for
> builder factory method...
> 2014-07-25 09:25:43,099 DEBUG No builder factory method found in class
> org.apache.logging.log4j.core.config.LoggersPlugin. Going to try finding a
> factory method instead.
> 2014-07-25 09:25:43,099 DEBUG Still building Plugin[name=loggers,
> class=org.apache.logging.log4j.core.config.LoggersPlugin]. Searching for
> factory method...
> 2014-07-25 09:25:43,099 DEBUG Found factory method [createLoggers]: public
> static org.apache.logging.log4j.core.config.Loggers
> org.apache.logging.log4j.core.config.LoggersPlugin.createLoggers(org.apache.logging.log4j.core.config.LoggerConfig[]).
> 2014-07-25 09:25:43,099 DEBUG Calling createLoggers on class
> org.apache.logging.log4j.core.config.LoggersPlugin for element Loggers with
> params(={root})
> 2014-07-25 09:25:43,099 DEBUG Built Plugin[name=loggers] OK from factory
> method.
> 2014-07-25 09:25:43,099 ERROR Unable to locate appender Memory for logger
> 2014-07-25 09:25:43,099 DEBUG Started configuration
> XmlConfiguration[location=D:\gitlab\project\src\main\webapp\WEB-INF\classes\log4j2.xml]
> OK.
> 2014-07-25 09:25:43,099 TRACE Stopping
> org.apache.logging.log4j.core.config.DefaultConfiguration@bf1d3b...
> 2014-07-25 09:25:43,099 TRACE AbstractConfiguration stopped 0
> AsyncLoggerConfigs.
> 2014-07-25 09:25:43,099 TRACE AbstractConfiguration stopped 0 AsyncAppenders.
> 2014-07-25 09:25:43,099 DEBUG Shutting down OutputStreamManager SYSTEM_OUT
> 2014-07-25 09:25:43,099 TRACE AbstractConfiguration stopped 1 Appenders.
> 2014-07-25 09:25:43,099 TRACE AbstractConfiguration stopped 0 Loggers.
> 2014-07-25 09:25:43,099 DEBUG Stopped
> org.apache.logging.log4j.core.config.DefaultConfiguration@bf1d3b OK
> 2014-07-25 09:25:43,146 DEBUG Registering MBean
> org.apache.logging.log4j2:type=sun.misc.Launcher$AppClassLoader@192d342
> 2014-07-25 09:25:43,146 DEBUG Registering MBean
> org.apache.logging.log4j2:type=sun.misc.Launcher$AppClassLoader@192d342,component=StatusLogger
> 2014-07-25 09:25:43,146 DEBUG Registering MBean
> org.apache.logging.log4j2:type=sun.misc.Launcher$AppClassLoader@192d342,component=ContextSelector
> 2014-07-25 09:25:43,146 DEBUG Registering MBean
> org.apache.logging.log4j2:type=sun.misc.Launcher$AppClassLoader@192d342,component=Loggers,name=
> 2014-07-25 09:25:43,146 DEBUG Reconfiguration complete for
> context[name=sun.misc.Launcher$AppClassLoader@192d342] at null
> (org.apache.logging.log4j.core.LoggerContext@10c3a08)
> 2014-07-25 09:25:43,146 DEBUG Shutdown hook enabled. Registering a new one.
> 2014-07-25 09:25:43,146 DEBUG
> LoggerContext[name=sun.misc.Launcher$AppClassLoader@192d342,
> org.apache.logging.log4j.core.LoggerContext@10c3a08] started OK.
> 2014-07-25 09:25:43,177 DEBUG Using default SystemClock for timestamps
> {code}
> Code
> {code}
> @Plugin(name = "Memory", category = "Core", elementType = "appender",
> printObject = true)
> public final class MemoryAppender extends
> AbstractOutputStreamAppender<OutputStreamManager> {
> private static MemoryManagerFactory factory = new MemoryManagerFactory();
> private MemoryAppender(final String name, final Layout<? extends
> Serializable> layout, final Filter filter,
> final OutputStreamManager manager, final boolean
> ignoreExceptions) {
> super(name, layout, filter, ignoreExceptions, true, manager);
> }
> @PluginFactory
> public static MemoryAppender createAppender(@PluginElement("Layout")
> Layout<? extends Serializable> layout,
> @PluginElement("Filters") final Filter filter,
> @PluginAttribute("name") final String name,
> @PluginAttribute(value = "ignoreExceptions", defaultBoolean =
> true) final String ignore) {
> if (name == null) {
> LOGGER.error("No name provided for MemoryAppender");
> return null;
> }
> if (layout == null) {
> layout = PatternLayout.createDefaultLayout();
> }
> final boolean ignoreExceptions = Booleans.parseBoolean(ignore, true);
> final ByteArrayOutputStream outputStream = new
> ByteArrayOutputStream();
> return new MemoryAppender(name, layout, filter,
> getManager(outputStream, name, layout), ignoreExceptions);
> }
> private static OutputStreamManager getManager(final ByteArrayOutputStream
> outputStream, final String name,
> final Layout<? extends Serializable> layout) {
> final OutputStream os = getOutputStream(outputStream);
> return OutputStreamManager.getManager(name, new FactoryData(os,
> layout), factory);
> }
> private static OutputStream getOutputStream(final ByteArrayOutputStream
> outputStream) {
> return new MemoryStream(outputStream);
> }
> private static class MemoryStream extends OutputStream {
> private final ByteArrayOutputStream output;
> public MemoryStream(ByteArrayOutputStream outputStream) {
> this.output = outputStream;
> }
> @Override
> public void write(final int b) {
> output.write(b);
> }
> }
> private static class FactoryData {
> private final OutputStream os;
> private final Layout<? extends Serializable> layout;
> public FactoryData(final OutputStream os, final Layout<? extends
> Serializable> layout) {
> this.os = os;
> this.layout = layout;
> }
> }
> private static class MemoryManagerFactory implements
> ManagerFactory<OutputStreamManager, FactoryData> {
> @Override
> public OutputStreamManager createManager(final String name, final
> FactoryData data) {
> return new MemoryOutputStreamManager(data.os, name, data.layout);
> }
> }
> private static class MemoryOutputStreamManager extends
> OutputStreamManager {
> public MemoryOutputStreamManager(OutputStream os, String streamName,
> Layout<?> layout) {
> super(os, streamName, layout);
> }
> }
> }
> {code}
> Configuration
> {code}
> <?xml version="1.0" encoding="UTF-8"?>
> <Configuration status="ALL" packages="com.xxx.project.log">
> <Appenders>
> <Memory name="Memory">
> <PatternLayout charset="GBK" pattern="%d{HH:mm:ss.SSS} [%t] %-5level
> %logger{36} - %msg%n" />
> </Memory>
> </Appenders>
> <Loggers>
> <Root level="info">
> <AppenderRef ref="Memory"/>
> </Root>
> </Loggers>
> </Configuration>
> {code}
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