How to tail Tomcat in Linux

In TOMCAT_HOME directory:
tail -f logs/catalina.out

Java: How to Convert Array to List

Object[] array = new Object[]{"12","23","34"};
java.util.List list = Arrays.asList(array);

Start Tomcat At 128m

The easiest way to start Tomcat at 128m is to set CATALINA_OPTS as an environment variable.

CATALINA_OPTS
-Xms128m -Xmx256m

How To Get A Value From Your Properties File

Properties properties = new Properties();

try {
ClassLoader classLoader = Thread.currentThread()
.getContextClassLoader();
InputStream is = classLoader
.getResourceAsStream("file.properties");
if (is != null) {
properties.load(is);
value = properties.getProperty("key");
is.close();
}
is = null;
}

catch (Exception e) {
e.printStackTrace();
}

How To Attach AsyncAppender To Your Other Appenders

In your log4j.xml, define the AsyncAppender and reference the other appenders that you want to attach to it.

appender name="ASYNC" class="org.apache.log4j.AsyncAppender"
appender-ref ref="STDOUT"
appender

appender name=STDOUT" class="org.apache.log4j.ConsoleAppender"
layout class="org.apache.log4j.PatternLayout"
param name="ConversionPattern" value="%d{HH:mm:ss:SSS} %-5p %C:%L %M() %m%n"
layout
appender

Then define ASYNC as your root logger.

root
appender-ref ref="ASYNC"
root