異常：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'
場景；在使用spring整合hibernate事務時報錯
解決：spring-aop中已經包含aopaliance，刪除多餘的jar包

異常：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
場景：在使用spring整合hibernate呼叫的HibernateTemplate時報錯
解決: 在spring配置檔案中新增事務的配置

    <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>

異常：android.os.NetworkOnMainThreadException
場景：安卓開發時在主執行緒訪問網路
解決：將訪問網路的程式碼使用Thread操作

Handler handler = new Handler(){
    @Override
    public void handleMessage(Message msg){
        Bundle data = msg.getData();
        //從data中拿出存的資料
        String val = data.getString("value");
        //將資料進行顯示到介面等操作
    }
};
Runnable runnable = new Runnable(){
    @Override
    public void run(){
        //進行訪問網路操作
        Message msg = Message.obtain();
        Bundle data = new Bundle();
        data.putString("value", "存放資料");
        msg.setData(data);
        handler.sendMessage(msg);
    }
};

異常: 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
場景: eclipse連結不上阿里雲hadoop
解決: 將hadoop的配置檔案中的ip改為內網IP即可

異常: 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.
場景: 在配置hadoop時，無法啟動 NodeManager
解決: 本機配置不滿足，修改yarn-siet.xml檔案

<!-- 設定記憶體 -->
<property>
    <name>yarn.nodemanager.resource.memory-mb</name>
    <value>1600</value>
</property>
<!-- 設定cpu 核數 -->
<property>
    <name>yarn.nodemanager.resource.cpu-vcores</name>
    <value>1</value>
</property>

異常: The server time zone value 'Öйú±ê׼ʱ¼ä' 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.
場景: Java 連線 MySQL 時連線不上
解決: 修改資料庫時區
1.在mysql中執行如下語句
set global time_zone='+8:00';
2.修改資料庫連線的url,加上如下引數(指定時區):
serverTimezone=GMT

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