Java 8升級後無法獲得數據庫連接

Question

我最近將應用程序從java 1.7升級到1.8。其餘的庫版本保持不變。我在升級後得到以下錯誤：

DEBUG 2015-11-12 09:55:12 BasicResourcePool   An exception occurred while acquiring a poolable resource. Will retry. 
java.lang.NullPointerException 
    at oracle.net.jndi.JndiAttrs.getAttrs(JndiAttrs.java:207) 
    at oracle.net.resolver.AddrResolution.<init>(AddrResolution.java:198) 
    at oracle.net.ns.NSProtocol.connect(NSProtocol.java:219) 
    at oracle.jdbc.driver.T4CConnection.connect(T4CConnection.java:1102) 
    at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:320) 
    at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:546) 
    at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:236) 
    at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:32) 
    at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:521) 
    at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:134) 
    at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:182) 
    at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:171) 
    at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:137) 
    at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1014) 
    at com.mchange.v2.resourcepool.BasicResourcePool.access$800(BasicResourcePool.java:32) 
    at com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:1810) 
    at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547) 

Hibernate的配置：

<hibernate-configuration> 
    <session-factory> 
     <property name="hibernate.connection.driver_class">oracle.jdbc.driver.OracleDriver</property> 
     <property name="hibernate.connection.url">jdbc:oracle:thin:@ldaps://XXXX,cn=OOOO,dc=WWW</property> 
     <property name="hibernate.connection.username">YYYY</property> 
     <property name="hibernate.statement_cache.size">0</property> 
     <property name="hibernate.connection.password">ZZZZZ</property> 
     <property name="hibernate.c3p0.min_size">5</property> 
     <property name="hibernate.c3p0.max_size">20</property> 
     <property name="hibernate.c3p0.timeout">1800</property> 
     <property name="hibernate.c3p0.max_statements">0</property> 
     <property name="hibernate.default_schema">YYYY</property> 
     <property name="hibernate.dialect">org.hibernate.dialect.OracleDialect</property> 
     <property name="hibernate.show_sql">true</property> 
    </session-factory> 
</hibernate-configuration> 

相關的庫用於：

• ojdbc6 11.2.0.3.0
• 冬眠3.1

問題： 依賴關係包含2個休眠版本3.1和3.0以及ojdbc6和ojdbc7。 （用於mvn dependency:tree -Dverbose得了依賴關係樹）

解決方案： 排除依賴Hibernate和ojdbc的其他版本。

  <dependency> 
       <groupId>****</groupId> 
       <artifactId>****</artifactId> 
       <version>****</version> 
       <exclusions> 
        <exclusion> 
         <groupId>hibernate</groupId> 
         <artifactId>hibernate</artifactId> 
        </exclusion> 
        <exclusion> 
         <groupId>com.oracle</groupId> 
         <artifactId>ojdbc6</artifactId> 
        </exclusion> 
       </exclusions> 
      </dependency> 

Answer 1

，我可以從Oracle FAQ看，你所使用的JDBC驅動程序與數據庫版本和JDK8兼容。

支持的各種Oracle數據庫版本與JDBC兼容版本與JDK版本支持哪些？

我認爲這一定是你的問題。也許如果你使用ojdbc7.jar可能會幫助（不知道這個原因，我還沒有測試過 - 最可能的這將失敗）