Method-Based Injection

To use method-based injection, declare a setter method and decorate it with the @Resource annotation. The container will infer the name and type of the resource if the name and type elements are not specified. The setter method must follow the JavaBeans conventions for property names: the method name must begin with set, have a void return type, and only one parameter. If you do specify the type element, it must match the field’s type declaration.

package com.example;

public class SomeClass {

    private javax.sql.DataSource myDB;
...
    @Resource
    private void setMyDB(javax.sql.DataSource ds) {
        myDB = ds;
    }
...
}

In the code above, the container infers the name of the resource based on the class name and the field name: com.example.SomeClass/myDB. The inferred type is javax.sql.DataSource.class.

package com.example;

public class SomeClass {

    private javax.sql.DataSource myDB;
...
    @Resource(name="customerDB")
    private void setMyDB(javax.sql.DataSource ds) {
        myDB = ds;
    }
...
}

In the code above, the JNDI name is customerDB, and the inferred type is javax.sql.DataSource.class.