Java中遇到过的一些异常及处理
异常:bean named 'org.springframework.transaction.interceptor.transactioninterceptor#0' is expected to be of type 'org.aopalliance.aop.advice' but was actually of type 'org.springframework.transaction.interceptor.transactioninterceptor'
场景;在使用spring整合hibernate事务时报错
解决:spring-aop中已经包含aopaliance,删除多余的jar包
异常:gethibernateflushmode is not valid without active transaction; nested exception is org.hibernate.hibernateexception: gethibernateflushmode is not valid without active transaction gethibernateflushmode is not valid without active transaction
场景:在使用spring整合hibernate调用的hibernatetemplate时报错
解决: 在spring配置文件中添加事务的配置
<bean id="hibernatetransactionmanager" class="org.springframework.orm.hibernate5.hibernatetransactionmanager"> <!-- 注入sessionfactory,配置sessionfactory --> <property name="sessionfactory" ref="sessionfactory"></property> </bean> <tx:advice id="txadvice" transaction-manager="hibernatetransactionmanager"> <tx:attributes> <tx:method name="get*" read-only="true" /> <tx:method name="*" /> </tx:attributes> </tx:advice> <aop:config> <aop:pointcut id="personserviceoperation" expression="execution(* user.service.userserviceimpl.*(..))" /> <aop:advisor advice-ref="txadvice" pointcut-ref="personserviceoperation" /> </aop:config>
异常:android.os.networkonmainthreadexception
场景:安卓开发时在主线程访问网络
解决:将访问网络的代码使用thread操作
handler handler = new handler(){ @override public void handlemessage(message msg){ bundle data = msg.getdata(); //从data中拿出存的数据 string val = data.getstring("value"); //将数据进行显示到界面等操作 } }; runnable runnable = new runnable(){ @override public void run(){ //进行访问网络操作 message msg = message.obtain(); bundle data = new bundle(); data.putstring("value", "存放数据"); msg.setdata(data); handler.sendmessage(msg); } };
异常: call from * 9000 failed on connection exception: java.net.connectexception: connection refused: no further information; for more details see: http://wiki.apache.org/hadoop/connectionrefused
场景: eclipse链接不上阿里云hadoop
解决: 将hadoop的配置文件中的ip改为内网ip即可
异常: recieved shutdown signal from resourcemanager ,registration of nodemanager failed, message from resourcemanager: nodemanager from localhost doesn't satisfy minimum allocations, sending shutdown signal to the nodemanager.
场景: 在配置hadoop时,无法启动 nodemanager
解决: 本机配置不满足,修改yarn-siet.xml文件
<!-- 设置内存 --> <property> <name>yarn.nodemanager.resource.memory-mb</name> <value>1600</value> </property> <!-- 设置cpu 核数 --> <property> <name>yarn.nodemanager.resource.cpu-vcores</name> <value>1</value> </property>
异常: the server time zone value 'öð¹ú±ê׼걼ä' is unrecognized or represents more than one time zone. you must configure either the server or jdbc driver (via the servertimezone configuration property) to use a more specifc time zone value if you want to utilize time zone support.
场景: java 连接 mysql 时连接不上
解决: 修改数据库时区
1.在mysql中执行如下语句
set global time_zone='+8:00';
2.修改数据库连接的url,加上如下参数(指定时区):
servertimezone=gmt
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