我试图设置一个spring-boot应用程序来连接到IBM i机器上的DB2数据库。我已经将一个Maven依赖关系添加到IBM jdbc驱动程序com.ibm.as400.access.AS400JDBCDriver
并将spring.datasource.driver-class-name="com.ibm.as400.access.AS400JDBCDriver"
添加到application.properties文件。Spring Boot和ibm JDBC驱动程序的ClassNotFoundException
当我运行该应用程序时,出现错误Cannot load driver class: "com.ibm.as400.access.AS400JDBCDriver
。误差在ClassUtils.forName
线以下发生在从春天启动的DataSourceProperties类org.springframework.boot.autoconfigure.jdbc
private boolean driverClassIsLoadable() {
try {
ClassUtils.forName(this.driverClassName, null); <----- Exception happens here.
return true;
}
catch (UnsupportedClassVersionError ex) {
// Driver library has been compiled with a later JDK, propagate error
throw ex;
}
catch (Throwable ex) {
return false;
}
}
this.driverClassName等于“com.ibm.as400.access.AS400JDBCDriver”。有趣的是,在我的主要方法中,我可以使用相同的driverClassName调用相同的函数,并且不会有任何异常。
@SpringBootApplication
public class MinimumExampleApplication {
public static void main(String[] args) throws ClassNotFoundException, LinkageError {
ClassUtils.forName("com.ibm.as400.access.AS400JDBCDriver", null); <---- No exception here?
SpringApplication.run(MinimumExampleApplication.class, args);
}
}
我的问题是,为什么弹簧引导无法找到驱动程序,当我可以找到驱动程序,如果我自己加载它?
完整程序
MinimumExample.java
package org.mystuff.annual.meeting.signup;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.util.ClassUtils;
@SpringBootApplication
public class MinimumExampleApplication {
public static void main(String[] args) throws ClassNotFoundException, LinkageError {
ClassUtils.forName("com.ibm.as400.access.AS400JDBCDriver", null);
SpringApplication.run(MinimumExampleApplication.class, args);
}
}
application.properties
spring.datasource.driver-class-name="com.ibm.as400.access.AS400JDBCDriver"
spring.datasource.url="jdbc:db2://myserver/myDb"
spring.datasource.dbcp2.initial-size=2
spring.datasource.dbcp2.max-total=5
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<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>org.mystuff</groupId>
<artifactId>annual-meeting-signup</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>minimum-example</name>
<description>Playing with data repository</description>
<parent>
<groupId>org.mystuff</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.2.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.ibm.as400</groupId>
<artifactId>jt400</artifactId>
<version>8</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
那其他类,其中,你所得到的例外呢?该类是否注有Spring注释?换句话说,它是春天的豆子吗? –
另一个类是Spring-Boot中的DataSourceProperties,因此它是库代码。据我所知,配置dataSource时会被调用。 –
我怀疑这是引起问题的'application.properties'中属性值的引号。如果你删除它们会发生什么? –