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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