The property IMQ_DEFAULT_EXT_JARS has been added to the imqenv.conf file. You can set this property to specify the path names of external .jar files to be included in CLASSPATH when the broker starts up. If you use this property to specify the location of external .jar files, you will no longer need to copy these files to the lib/ext directory. External jars can refer to JDBC drivers or to JAAS login modules. The following sample command, specifies the location of jdbc drivers.