java.net.ConnectException怎么处理？

Question

org.apache.catalina.core.StandardWrapperValve invoke 严重: Servlet.service() for servlet [dispatcher] in context with path [/platform] threw exception [Filtered request failed.] with root cause java.net.ConnectException: Connection refused: connect     at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)     at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85)     at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)     at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)     at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)     at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)     at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)     at java.net.Socket.connect(Socket.java:589)     at redis.clients.jedis.Connection.connect(Connection.java:184)     at redis.clients.jedis.BinaryClient.connect(BinaryClient.java:93)     at redis.clients.jedis.BinaryJedis.connect(BinaryJedis.java:1767)     at redis.clients.jedis.JedisFactory.makeObject(JedisFactory.java:106)     at org.apache.commons.pool2.impl.GenericObjectPool.create(GenericObjectPool.java:868)     at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:458)     at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:363)     at redis.clients.util.Pool.getResource(Pool.java:49)     at redis.clients.jedis.JedisPool.getResource(JedisPool.java:226)     at redis.clients.jedis.JedisPool.getResource(JedisPool.java:16)     at net.oschina.j2cache.redis.RedisPubSubClusterPolicy.publish(RedisPubSubClusterPolicy.java:146)     at net.oschina.j2cache.redis.RedisPubSubClusterPolicy.connect(RedisPubSubClusterPolicy.java:102)     at net.oschina.j2cache.cluster.ClusterPolicyFactory.redis(ClusterPolicyFactory.java:68)     at net.oschina.j2cache.cluster.ClusterPolicyFactory.init(ClusterPolicyFactory.java:43)

Answer 1

根据报错，可以判断请求已经被tomcat接受并开始处理，但是在装载类的时候找不到Could not initialize class com.platform.cache.J2CacheUtils，无法初始化这个类，原因基本上有以下几点：
1.在打war包的时候没有将依赖的jar包打进去
2.依赖的jar包没有被成功加载
具体可以去看下项目lib目录底下的jar包，先确认依赖包正常被加载