I have a spring boot 2 java app and would like to use interpreted (not compiled) groovy code to inject aop. From reading the spring documentation this sounds like it is possible, but I could'nt find any examples. AOP - advising scripted beans:
You are of course not just limited to advising scripted beans… you can also write aspects themselves in a supported dynamic language and use such beans to advise other Spring beans. This really would be an advanced use of the dynamic language support though.
At the end I would like to have a directory where I could add groovy scripts (for business logic) to the application that will inject themself via spring-aop.
What I am not sure about is what is spring boot 2 automagically doing in such a case, or do I have to integrate code based on org.springframework.scripting manually?
So here is my small test project:
project
|-pom.xml
|src/main/java/de/test
|-Commandline.java
|-MytestApplication.java
|-TestConfig.java
|-GetText.java
|src/main/resources/groovy
|-testAspect.groovy
|src/main/resources
|-application.properties (empty at the moment)
|-applicationContext.xml
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>de.test</groupId>
<artifactId>mytest</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>mytest</name>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.4.RELEASE</version>
<relativePath/>
</parent>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-aop</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.codehaus.groovy</groupId>
<artifactId>groovy</artifactId>
</dependency>
</dependencies>
</project>
TestConfig.java
package de.test;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.EnableAspectJAutoProxy;
@Configuration
@EnableAspectJAutoProxy
@ComponentScan({"de.test", "groovy"})
@ImportResource({"classpath*:applicationContext.xml"})
public class TestConfig
{
}
applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.springframework.org/schema/beans" xmlns:lang="http://www.springframework.org/schema/lang" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
<lang:groovy id="testAspect" refresh-check-delay="30000" script-source="classpath:groovy/TestAspect.groovy"/>
</beans>
MytestApplication.java
package de.test;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
@ComponentScan({"de.test", "groovy"})
@SpringBootApplication
public class SpringboottestApplication
{
public static void main(final String[] args)
{
SpringApplication.run(SpringboottestApplication.class, args);
}
}
GetText.java
package de.test;
import org.springframework.stereotype.Component;
@Component
public class GetText
{
public String getText()
{
return "test1";
}
}
Commandline.java
package de.test;
import org.springframework.boot.CommandLineRunner;
import org.springframework.stereotype.Component;
@Component
public class Commandline implements CommandLineRunner
{
@Autowired
GetText textbean;
public Commandline()
{
super();
}
@Override
public void run(final String... args) throws Exception
{
System.out.println((this.textbean.getText());
}
}
testAspect.groovy
package groovy
import org.springframework.stereotype.Component
import org.aspectj.lang.ProceedingJoinPoint
import org.aspectj.lang.annotation.Around
import org.aspectj.lang.annotation.Aspect
@Aspect
@Component
class TestAspect
{
@Around("execution(String de.test.GetText.getText())")
public String doChangeGetText(ProceedingJoinPoint pjp) throws Throwable
{
String retVal = (String)pjp.proceed();
return retVal + "; test2";
}
}
After
mvn clean install
I start it with
java -jar target/mytest-0.0.1-SNAPSHOT.jar
Which results in only "test1" as output instead of the wanted "test1; test2".
Update1:
- Added TestConfig.java
- Moved src/main/groovy/groovy/testAspect.groovy to src/main/resources/groovy/testAspect.groovy
- Improved some things, but still does not work.
Update2:
- Added GetText.java
- Modified Commandline.java to use GetText bean
- Changed PointCut
- Still doesn't work
Update3:
- Added applicationContext.xml
- Now runing in an org.springframework.aop.AopInvocationException: Mismatch on arguments to advice method [public java.lang.String groovy.TestAspect.doChangeGetText(org.aspectj.lang.ProceedingJoinPoint) throws java.lang.Throwable]; pointcut expression [org.aspectj.weaver.internal.tools.PointcutExpressionImpl@4c4f4365]; nested exception is java.lang.IllegalArgumentException: object is not an instance of declaring class
- When copying the testAspect.groovy over as java class - then the pointcut works as expected and ";test 2" will be appended, but as groovy script the above exception will haben.
- Adding an interface IGetText and/or IAspectTest will not help
