小编Tim*_*ohl的帖子

在程序进行数据库操作大约一分钟后,我收到以下异常:

WARN : org.hibernate.util.JDBCExceptionReporter - SQL Error: 0, SQLState: 08S01
ERROR: org.hibernate.util.JDBCExceptionReporter - Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
org.springframework.dao.DataAccessResourceFailureException: Cannot open connection; nested exception is org.hibernate.exception.JDBCConnectionException: Cannot open connection
    at org.springframework.orm.hibernate3.SessionFactoryUtils.convertHibernateAccessException(SessionFactoryUtils.java:631)
    at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:104)
    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.translateExceptionIfPossible(AbstractEntityManagerFactoryBean.java:403)
    at org.springframework.dao.support.ChainedPersistenceExceptionTranslator.translateExceptionIfPossible(ChainedPersistenceExceptionTranslator.java:58)
    at org.springframework.dao.support.DataAccessUtils.translateIfNecessary(DataAccessUtils.java:213)
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:163)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
    at $Proxy36.getBankResultsForDate(Unknown Source)
    at com.***.service.ScanResultDataServiceImpl.getBankResultsForDate(ScanResultDataServiceImpl.java:138)
    at com.***.CalculateScore.main(CalculateScore.java:63)
Caused by: org.hibernate.exception.JDBCConnectionException: Cannot open connection
    at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:99) …

我在使用iText for java(版本5.3.2)格式化PDF文档时遇到问题.

我的文档应如下所示:

text1word1 text1word2 text1word3.    --
***                                   |
-----------                           |
| image 1 |                           |
-----------                           |- page 1
***                                   |
***                                   | 
text2word1 text2word2 text2word3.     |
***                                  --
-----------                          --
| image 2 |                           |
-----------                           |
***                                   |
***                                   |- page 2
text3word1 text3word2 text3word3.     | 
***                                   |
-----------                           |
| image 3 |                           |
-----------                          --

* =空间

但是在一个接一个地添加所有元素之后,我得到这样的东西:

text1word1 text1word2 text1word3.     --
***                                    |
-----------                            |
| image 1 |                            |
-----------                            |- page …

我正在使用Hadoop将JSON转换为CSV文件以使用Hive访问它们.

目前,Mapper正在填充一个自己的数据结构,使用JSON-Smart解析JSON.然后reducer正在读出该对象并将其写入文件,用逗号分隔.为了加快速度,我已经在数据结构中实现了可写接口......

现在我想使用Avro为数据结构对象提供更多的灵活性和性能.如何更改我的类以使它们交换Avro对象而不是可写？