在spring tomcat应用程序中无法为连接URL'null创建类''的JDBC驱动程序

Question

I am getting the following exception while getting datasource through jndi:

Caused by: org.springframework.jdbc.CannotGetJdbcConnectionException:
     Could not get JDBC Connection; nested exception is
     org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC driver of class '' for connect URL 'null

Tomcat's server.xml :

     <Resource name="jdbc/testdb" auth="Container" type="javax.sql.DataSource"
          username="test" password="test1234"
          url="*********"
          driverClass="oracle.jdbc.driver.OracleDriver"
          initialSize="5" maxWait="5000"
          maxActive="120" maxIdle="5"
          validationQuery="select 1"
          poolPreparedStatements="true"/>    

Tomcat's Context.xml :

<ResourceLink name="jdbc/testdb" global="jdbc/testdb"
type="javax.sql.DataSource" />     

Spring's servlet xml :

<jee:jndi-lookup id="dataSource" jndi-name="jdbc/testdb"  resource-ref="true" />

and final Web.xml :

   <resource-ref>
       <description>Resource reference to database</description>
       <res-ref-name>jdbc/testdb</res-ref-name>
       <res-type>javax.sql.DataSource</res-type>
       <res-auth>Container</res-auth>
       <res-sharing-scope>Shareable</res-sharing-scope>
</resource-ref>

Could somebody please help me?

Error Stack trace :

  Error querying database.  Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC driver of class '' for connect URL 'null'

Answer 1

尝试driverClassName而不是driverClass ：

driverClassName="oracle.jdbc.driver.OracleDriver"

Answer 2

I am using Eclipse STS 3.9.3, tomcat 8.5 and Spring Boot 2.0.0.RELEASE

I spent my entire morning about this problem. So, I did a lot of things to solve:

1. Remove jdbc dependence from my pom.

    <!-- dependency> <groupId>org.postgresql</groupId> <artifactId>postgresql</artifactId> <scope>runtime</scope> </dependency-->

2. Declaration resource TOMCAT_HOME/CONF/server.xml whit factory:

    <GlobalNamingResources> ... <Resource name="jdbc/postgres_jndi" auth="Container" type="javax.sql.DataSource" driverClassName="org.postgresql.Driver" url="jdbc:postgresql://xxx.xxx.xx.xxx:5432/db" factory="org.apache.tomcat.jdbc.pool.DataSourceFactory" removeAbandonedOnBorrow="true" removeAbandonedOnMaintenance="true" timeBetweenEvictionRunsMillis="10000" removeAbandonedTimeout="60" logAbandoned="true" username="xxx" password="xxxxxx" maxTotal="20" maxIdle="10" maxWaitMillis="-1"/> ... </GlobalNamingResources>

   I realized that I was using Eclipse STS. The tomcat resource on server.xml only works after I put the resource declaration in server.xml inside of "Tomcat v8.5 Server at localhost-config" folder in my Server project. Did not work on TOMCAT_HOME/conf folder in server.xml file.

3. Change my application.yml to:

    spring: datasource: platform: postgres jndi-name: java:comp/env/jdbc/postgres_jndi type: javax.sql.DataSource driver-class-name: org.postgresql.Driver jpa: hibernate: ddl-auto: validate database-platform: org.hibernate.dialect.PostgreSQL9Dialect database: POSTGRESQL show-sql: true #Method org.postgresql.jdbc.PgConnection.createClob() is not yet implemented. properties: hibernate: temp: use_jdbc_metadata_defaults: false

I think that you miss java:comp/env/ yours will be like this:
<jee:jndi-lookup id="dataSource" jndi-name="java:comp/env/jdbc/testdb" resource-ref="true" />

A application.properties will be like:

    spring.datasource.platform= postgres
    spring.datasource.jndi-name= java:comp/env/jdbc/postgres_jndi
    spring.datasource.type= javax.sql.DataSource
    spring.datasource.driver-class-name= org.postgresql.Driver
    spring.jpa.hibernate.ddl-auto= validate
    spring.jpa.hibernatedatabase-platform= org.hibernate.dialect.PostgreSQL9Dialect
    spring.jpa.database= POSTGRESQL
    spring.jpa.show-sql= true
    spring.jpa.properties.hibernate.temp.use_jdbc_metadata_defaults=false

4. Define a context.xml file in src/main/webapp/META-INF/context.xml with definition:

    <?xml version="1.0" encoding="UTF-8"?> <Context path="/myapp"> <ResourceLink global="jdbc/postgres_jndi" name="jdbc/postgres_jni" type="javax.sql.DataSource"/> </Context>

5. Put the file postgresql-42.2.2.jar in the TOMCAT_HOME/lib