【发布时间】：2016-04-14 00:40:46
【问题描述】：
我正在创建一个 RESTful 应用程序，但在为新连接进行转换时遇到问题。 我的应用服务器是 Wildfly 10.0。
standalone-full.xml 中的数据源和驱动程序：
<datasource jndi-name="java:jboss/datasources/PostgreDS" pool-name="PostgreDS" enabled="true" use-java-context="true">
<connection-url>jdbc:postgresql://192.168.0.112:5432/bdns</connection-url>
<driver>postgresql</driver>
<transaction-isolation>TRANSACTION_READ_COMMITTED</transaction-isolation>
<pool>
<min-pool-size>10</min-pool-size>
<max-pool-size>40</max-pool-size>
<prefill>true</prefill>
</pool>
<security>
<user-name>sa</user-name>
<password>000000</password>
</security>
<statement>
<prepared-statement-cache-size>32</prepared-statement-cache-size>
<share-prepared-statements>true</share-prepared-statements>
</statement>
</datasource>
<drivers>
<driver name="postgresql" module="org.postgresql">
<xa-datasource-class>org.postgresql.xa.PGXADataSource</xa-datasource-class>
</driver>
</drivers>
Java 代码 ConnectionMng.java：
package dao;
import java.sql.Connection;
import java.sql.SQLException;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.DataSource;
import org.jboss.jca.adapters.jdbc.jdk7.WrappedConnectionJDK7;
import org.postgresql.jdbc.PgConnection;
public class ConnectionMng {
private DataSource ds;
private ConnectionMng() throws NamingException {
this.ds = (DataSource)new InitialContext().lookup("java:jboss/datasources/PostgreDS");
}
public PgConnection getPgConnection() throws SQLException {
WrappedConnectionJDK7 wrappedConn = (WrappedConnectionJDK7)ds.getConnection();
Connection underlyingConn = wrappedConn.getUnderlyingConnection();
return (PgConnection)underlyingConn;
}
}
发生异常：
ClassCastException: org.jboss.jca.adapters.jdbc.jdk7.WrappedConnectionJDK7 cannot be cast to org.jboss.jca.adapters.jdbc.jdk7.WrappedConnectionJDK7
pom.xml：
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>Core</groupId>
<artifactId>Core</artifactId>
<version>1.0.0-SNAPSHOT</version>
<packaging>war</packaging>
<name>Core</name>
<description>Core</description>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<java.version>1.8</java.version>
<javac.target>1.8</javac.target>
<postgresql.enforce.jdk.version>[1.7,1.8)</postgresql.enforce.jdk.version>
</properties>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.3.3.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.wildfly</groupId>
<artifactId>wildfly-connector</artifactId>
<version>10.0.0.Final</version>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
</dependency>
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-api</artifactId>
<version>7.0</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-dbcp2</artifactId>
</dependency>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.9.13</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.12</version>
</dependency>
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.1</version>
</dependency>
<dependency>
<groupId>com.thoughtworks.xstream</groupId>
<artifactId>xstream</artifactId>
<version>1.4.8</version>
</dependency>
<dependency>
<groupId>com.github.junrar</groupId>
<artifactId>junrar</artifactId>
<version>0.7</version>
</dependency>
<dependency>
<groupId>org.zeroturnaround</groupId>
<artifactId>zt-zip</artifactId>
<version>1.9</version>
<type>jar</type>
<exclusions>
<exclusion>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
</exclusion>
<exclusion>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<build>
<sourceDirectory>src</sourceDirectory>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<artifactId>maven-war-plugin</artifactId>
<configuration>
<warSourceDirectory>WebContent</warSourceDirectory>
<failOnMissingWebXml>false</failOnMissingWebXml>
</configuration>
</plugin>
</plugins>
</build>
【问题讨论】：
-
那么从
ds.getConnection()返回什么类型的Object？ -
@ScaryWombat 连接应用服务器是的。但我需要 PgConnection 类型。
-
看起来 ironjacamar-jars 打包在您的 WEB-INF-lib 目录中，可能是由于wildfly-connector-dependency。所以你有两类 WrappedConnectionJDK7 ：一类来自 lib-directory，一类来自 wildfly 的 modules-directory
-
@JanPiel 我该怎么做才能解决？
-
为什么不将您的 wildfly-connector 依赖项标记为 provided？ WildFly 已经拥有它。您无需将其与您的应用程序打包在一起。
标签： java connection wrapper wildfly classcastexception