Spring Boot和ibm JDBC驅動程序的ClassNotFoundException

我試圖設置一個spring-boot應用程序來連接到IBM i機器上的DB2數據庫。我已經將一個Maven依賴關係添加到IBM jdbc驅動程序com.ibm.as400.access.AS400JDBCDriver並將spring.datasource.driver-class-name="com.ibm.as400.access.AS400JDBCDriver"添加到application.properties文件。Spring Boot和ibm JDBC驅動程序的ClassNotFoundException

當我運行該應用程序時，出現錯誤Cannot load driver class: "com.ibm.as400.access.AS400JDBCDriver。誤差在ClassUtils.forName線以下發生在從春天啓動的DataSourceProperties類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等於「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調用相同的函數，並且不會有任何異常。

@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); 
    } 
}

我的問題是，爲什麼彈簧引導無法找到驅動程序，當我可以找到驅動程序，如果我自己加載它？

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>

來源

2017-04-03 Dustin Hodges

那其他類，其中，你所得到的例外呢？該類是否注有Spring註釋？換句話說，它是春天的豆子嗎？ –

另一個類是Spring-Boot中的DataSourceProperties，因此它是庫代碼。據我所知，配置dataSource時會被調用。 –

我懷疑這是引起問題的'application.properties'中屬性值的引號。如果你刪除它們會發生什麼？ –

由於@Andy威爾金兒子提到，問題是由我的application.properties文件中的引號造成的。我有它配置這樣

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

如果我換到它下面的工作

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

來源

2017-04-03 17:07:44

Spring Boot和ibm JDBC驅動程序的ClassNotFoundException

回答

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