Geronimo 1.x standalone configuration makes server log to wrong file

Booting Geronimo Kernel (in Java 1.5.0_22)...
log4j:ERROR setFile(null,true) call failed.
java.io.FileNotFoundException: \var\log\geronimo.log (Das System kann den angegebenen Pfad nicht finden)
	at java.io.FileOutputStream.openAppend(Native Method)
	at java.io.FileOutputStream.<init>(FileOutputStream.java:177)
	at java.io.FileOutputStream.<init>(FileOutputStream.java:102)
	at org.apache.log4j.FileAppender.setFile(FileAppender.java:272)
	at org.apache.log4j.RollingFileAppender.setFile(RollingFileAppender.java:156)
	at org.apache.log4j.FileAppender.activateOptions(FileAppender.java:151)
	at org.apache.log4j.config.PropertySetter.activate(PropertySetter.java:247)
	at org.apache.log4j.config.PropertySetter.setProperties(PropertySetter.java:123)
	at org.apache.log4j.config.PropertySetter.setProperties(PropertySetter.java:87)
	at org.apache.log4j.PropertyConfigurator.parseAppender(PropertyConfigurator.java:645)
	at org.apache.log4j.PropertyConfigurator.parseCategory(PropertyConfigurator.java:603)
	at org.apache.log4j.PropertyConfigurator.configureRootCategory(PropertyConfigurator.java:500)
	at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:406)
	at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:432)
	at org.apache.geronimo.system.logging.log4j.URLConfigurator.doConfigure(URLConfigurator.java:117)
	at org.apache.geronimo.system.logging.log4j.URLConfigurator.configure(URLConfigurator.java:44)
	at org.apache.geronimo.system.logging.log4j.Log4jService.reconfigure(Log4jService.java:519)
	at org.apache.geronimo.system.logging.log4j.Log4jService.doStart(Log4jService.java:562)
	at org.apache.geronimo.gbean.runtime.GBeanInstance.createInstance(GBeanInstance.java:981)
	at org.apache.geronimo.gbean.runtime.GBeanInstanceState.attemptFullStart(GBeanInstanceState.java:267)
	at org.apache.geronimo.gbean.runtime.GBeanInstanceState.start(GBeanInstanceState.java:102)
	at org.apache.geronimo.gbean.runtime.GBeanInstance.start(GBeanInstance.java:526)
	at org.apache.geronimo.gbean.runtime.GBeanDependency.attemptFullStart(GBeanDependency.java:111)
	at org.apache.geronimo.gbean.runtime.GBeanDependency.addTarget(GBeanDependency.java:146)
	at org.apache.geronimo.gbean.runtime.GBeanDependency$1.running(GBeanDependency.java:120)
	at org.apache.geronimo.kernel.basic.BasicLifecycleMonitor.fireRunningEvent(BasicLifecycleMonitor.java:173)
	at org.apache.geronimo.kernel.basic.BasicLifecycleMonitor.access$300(BasicLifecycleMonitor.java:41)
	at org.apache.geronimo.kernel.basic.BasicLifecycleMonitor$RawLifecycleBroadcaster.fireRunningEvent(BasicLifecycleMonitor.java:251)
	at org.apache.geronimo.gbean.runtime.GBeanInstanceState.attemptFullStart(GBeanInstanceState.java:292)
	at org.apache.geronimo.gbean.runtime.GBeanInstanceState.start(GBeanInstanceState.java:102)
	at org.apache.geronimo.gbean.runtime.GBeanInstanceState.startRecursive(GBeanInstanceState.java:124)
	at org.apache.geronimo.gbean.runtime.GBeanInstance.startRecursive(GBeanInstance.java:540)
	at org.apache.geronimo.kernel.basic.BasicKernel.startRecursiveGBean(BasicKernel.java:379)
	at org.apache.geronimo.kernel.config.ConfigurationUtil.startConfigurationGBeans(ConfigurationUtil.java:374)
	at org.apache.geronimo.kernel.config.ConfigurationUtil.loadBootstrapConfiguration(ConfigurationUtil.java:155)
	at org.apache.geronimo.kernel.config.ConfigurationUtil.loadBootstrapConfiguration(ConfigurationUtil.java:126)
	at org.apache.geronimo.system.main.Daemon.doStartup(Daemon.java:253)
	at org.apache.geronimo.system.main.Daemon.<init>(Daemon.java:74)
	at org.apache.geronimo.system.main.Daemon.main(Daemon.java:377)
Starting Geronimo Application Server v1.1.1