Error creating bean with name & #39; memcachedClient & #39;... java. lang. OutOfMemoryError

1. Tomcat startup error:

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'memcachedClient' defined in file [/usr/local/apache-tomcat-6.0.37_6500/webapps/trade_service/WEB-INF/classes/META-INF/spring/springContext_memcached.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public net.rubyeye.xmemcached.MemcachedClient net.rubyeye.xmemcached.XMemcachedClientBuilder.build() throws java.io.IOException] threw exception; nested exception is java.lang.OutOfMemoryError        at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:581)        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1015)        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:911)        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:485)        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)        at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:294)        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:225)        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:291)        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)        at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:322)        ... 44 moreCaused by: org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public net.rubyeye.xmemcached.MemcachedClient net.rubyeye.xmemcached.XMemcachedClientBuilder.build() throws java.io.IOException] threw exception; nested exception is java.lang.OutOfMemoryError        at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:169)        at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:570)        ... 53 moreCaused by: java.lang.OutOfMemoryError

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2. When you see an error when creating a memcache clent, go to the memcache server and check that memcache is running normally, and the memory is sufficient.

[root@localhost ~]# tail -f /tmp/memcache_error.log <287    0x00 0x00 0x00 0x00<287    0x00 0x00 0x00 0x00<287    0x00 0x00 0x00 0x00>287 Writing bin response:>287   0x81 0x0b 0x00 0x00>287   0x00 0x00 0x00 0x00>287   0x00 0x00 0x00 0x06>287   0x00 0x00 0x00 0x00>287   0x00 0x00 0x00 0x00>287   0x00 0x00 0x00 0x00...[root@localhost ~]# free -m             total       used       free     shared    buffers     cachedMem:          5938       3368       2570          0        195        296-/+ buffers/cache:       2876       3061Swap:         7935          0       7935[root@localhost ~]# 

Where is the problem? Check the error or warning information in the log:

[root@localhost ~]# cat  /tmp/memcache_error.log  |grep warning[root@localhost ~]# cat  /tmp/memcache_error.log  |grep error[root@localhost ~]#

There is no error message at all, and the problem is not identified in memcache.

3. check the tomcat server.

[root@localhost logs]# free -m             total       used       free     shared    buffers     cachedMem:         18022      16943       1078          0        104        675-/+ buffers/cache:      16162       1859Swap:        20031       8012      12019[root@localhost logs]# 

With only 1 GB of memory remaining, modify the tomcat memory Configuration:

[Root @ localhost bin] # vim catalina. sh

#JAVA_OPTS="-Xms2048m -Xmx2048m -Xss1024K -XX:PermSize=256m -XX:MaxPermSize=768m"# add by wangqi on 20140614 JAVA_OPTS="-Xms512m -Xmx512m -Xss128K -XX:PermSize=64m -XX:MaxPermSize=256m"

Restart tomcat again to see the same error.

4. Go back to the application to check the problem.

After troubleshooting with the developer, we can see that trade_service has started too many redundant transactions and reduced tomcat memory usage. Therefore, if you close unnecessary transactions and start tomcat again, no error will be reported.

Emotion: As with most web application cards and page logon failures, the slow response is mostly due to low-efficiency SQL statements. tomcat cannot be started, and most memory overflow occurs in java code, exercise caution when writing code or SQL statements.