SSH出现Caused by: java.lang.OutOfMemoryError: Java

Question

Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name '/addUser' defined in class path resource [applicationContext.xml]: Cannot resolve reference to bean 'userDAOProxy' while setting bean property 'dao'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userDAOProxy' defined in class path resource [applicationContext.xml]: Cannot resolve reference to bean 'transactionManager' while setting bean property 'transactionManager'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'transactionManager' defined in class path resource [applicationContext.xml]: Cannot resolve reference to bean 'sessionFactory' while setting bean property 'sessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in class path resource [applicationContext.xml]: Invocation of init method failed; nested exception is java.lang.OutOfMemoryError: Java heap space 
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userDAOProxy' defined in class path resource [applicationContext.xml]: Cannot resolve reference to bean 'transactionManager' while setting bean property 'transactionManager'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'transactionManager' defined in class path resource [applicationContext.xml]: Cannot resolve reference to bean 'sessionFactory' while setting bean property 'sessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in class path resource [applicationContext.xml]: Invocation of init method failed; nested exception is java.lang.OutOfMemoryError: Java heap space 
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'transactionManager' defined in class path resource [applicationContext.xml]: Cannot resolve reference to bean 'sessionFactory' while setting bean property 'sessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in class path resource [applicationContext.xml]: Invocation of init method failed; nested exception is java.lang.OutOfMemoryError: Java heap space 
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in class path resource [applicationContext.xml]: Invocation of init method failed; nested exception is java.lang.OutOfMemoryError: Java heap space 
Caused by: java.lang.OutOfMemoryError: Java heap space 
] 

Answer 1

看得出来，是在Tomcat等在加载ApplicationContext过程中，由于初始的Bean过多而发生的OOM。解决方法就是给Tomcat启动加大启动内存。

[1] 如果是在Eclipse中的Tomcat启动的，在启动配置中设置一个参数 
-Xmx512m 当然视你自己情况配置一个大小。 
在我的Eclipse的Tomcat的Run Configuration的VM arguments的内容如下：

-Dcatalina.base="D:\WORKSPACE\SDK-3.4\RAP\.metadata\.plugins\org.eclipse.wst.server.core\tmp0" -Dcatalina.home="D:\JAVA\apache-tomcat-5.5.20" -Dwtp.deploy="D:\WORKSPACE\SDK-3.4\RAP\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps" -Djava.endorsed.dirs="D:\JAVA\apache-tomcat-5.5.20\common\endorsed" -Xmx512m

[2] 如果直接使用Tomcat启动的， 
找到tomcat\bin\catalina.bat文件，同样也是加这个启动参数。 
下面是我的Tomcat的catalina.bat文件配置效果：

set JAVA_OPTS=%JAVA_OPTS% -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djava.util.logging.config.file="%CATALINA_BASE%\conf\logging.properties" -Xmx512m