Groovy类加载器不会加载Java类

Question

I have this groovy script written in .groovy file:

import groovy.sql.Sql;
def doit() {
    Class.forName('oracle.jdbc.driver.OracleDriver'); // If i skip this line it throws SQLException no driver registered for URL
    def db = [url:'jdbc:oracle:thin:/@localhost:1555:AVDB', user:'sys as sysdba', password:'secret',driver:'oracle.jdbc.driver.OracleDriver'];
    def sql = Sql.newInstance(db.url, db.user, db.password, db.driver) ;
    sql.execute 'CREATE USER RandomUser identified by Secret123';
}

I am calling above Groovy from Java in following way:

ClassLoader parent = getClass().getClassLoader();
GroovyClassLoader loader = new GroovyClassLoader(parent);

Class groovyClass = loader.parseClass(groovySource); // groovySource is a File object pointing to .groovy file
GroovyObject groovyObject = (GroovyObject) groovyClass.newInstance();
Object[] args = {};
groovyObject.invokeMethod("doit", args);

Problem :

Class oracle.jdbc.driver.OracleDriver is present in Java's classpath but groovy cant find it at line: Class.forName('oracle.jdbc.driver.OracleDriver');

Throws ClassNotFoundException.

Answer 1

try magic lines before groovy method:

@groovy.transform.CompileStatic
def doit(){....}

Answer 2

you should simply pass java CL down into your groovy method:

def doit( ClassLoader cl ) {
  cl.loadClass 'oracle.jdbc.driver.OracleDriver'
  ....
}

then call

ClassLoader parent = getClass().getClassLoader();
Object[] args = { parent };
groovyObject.invokeMethod("doit", args);