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yWorks / yGuard

The open-source Java obfuscation tool working with Ant and Gradle by yWorks - the diagramming experts

Home Page:https://yworks.github.io/yGuard/

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Springboot Java Code Obfuscation Error

Darshan-shivashankar opened this issue · comments

commented

Cloned and followed the exact steps in processing example,
however, facing the below error (trace attached below)
java.lang.IllegalArgumentException: No visible constructors in class com.yworks.example.HelloWorld.HelloWorldApplication at org.springframework.cglib.proxy.Enhancer.filterConstructors(Enhancer.java:760) ~[spring-core-5.2.4.RELEASE.jar!/:5.2.4.RELEASE] at org.springframework.cglib.proxy.Enhancer.generateClass(Enhancer.java:659) ~[spring-core-5.2.4.RELEASE.jar!/:5.2.4.RELEASE] at org.springframework.cglib.transform.TransformingClassGenerator.generateClass(TransformingClassGenerator.java:33) ~[spring-core-5.2.4.RELEASE.jar!/:5.2.4.RELEASE] at org.springframework.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25) ~[spring-core-5.2.4.RELEASE.jar!/:5.2.4.RELEASE] at org.springframework.cglib.core.ClassLoaderAwareGeneratorStrategy.generate(ClassLoaderAwareGeneratorStrategy.java:57) ~[spring-core-5.2.4.RELEASE.jar!/:5.2.4.RELEASE] at org.springframework.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:358) ~[spring-core-5.2.4.RELEASE.jar!/:5.2.4.RELEASE] at org.springframework.cglib.proxy.Enhancer.generate(Enhancer.java:582) ~[spring-core-5.2.4.RELEASE.jar!/:5.2.4.RELEASE] at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:110) ~[spring-core-5.2.4.RELEASE.jar!/:5.2.4.RELEASE] at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:108) ~[spring-core-5.2.4.RELEASE.jar!/:5.2.4.RELEASE] at org.springframework.cglib.core.internal.LoadingCache$2.call(LoadingCache.java:54) ~[spring-core-5.2.4.RELEASE.jar!/:5.2.4.RELEASE] at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[na:na] at org.springframework.cglib.core.internal.LoadingCache.createEntry(LoadingCache.java:61) ~[spring-core-5.2.4.RELEASE.jar!/:5.2.4.RELEASE] at org.springframework.cglib.core.internal.LoadingCache.get(LoadingCache.java:34) ~[spring-core-5.2.4.RELEASE.jar!/:5.2.4.RELEASE] at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData.get(AbstractClassGenerator.java:134) ~[spring-core-5.2.4.RELEASE.jar!/:5.2.4.RELEASE] at org.springframework.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:319) ~[spring-core-5.2.4.RELEASE.jar!/:5.2.4.RELEASE] at org.springframework.cglib.proxy.Enhancer.createHelper(Enhancer.java:569) ~[spring-core-5.2.4.RELEASE.jar!/:5.2.4.RELEASE] at org.springframework.cglib.proxy.Enhancer.createClass(Enhancer.java:416) ~[spring-core-5.2.4.RELEASE.jar!/:5.2.4.RELEASE] at org.springframework.context.annotation.ConfigurationClassEnhancer.createClass(ConfigurationClassEnhancer.java:137) ~[spring-context-5.2.4.RELEASE.jar!/:5.2.4.RELEASE] at org.springframework.context.annotation.ConfigurationClassEnhancer.enhance(ConfigurationClassEnhancer.java:109) ~[spring-context-5.2.4.RELEASE.jar!/:5.2.4.RELEASE] at org.springframework.context.annotation.ConfigurationClassPostProcessor.enhanceConfigurationClasses(ConfigurationClassPostProcessor.java:423) ~[spring-context-5.2.4.RELEASE.jar!/:5.2.4.RELEASE] at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanFactory(ConfigurationClassPostProcessor.java:257) ~[spring-context-5.2.4.RELEASE.jar!/:5.2.4.RELEASE] at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:286) ~[spring-context-5.2.4.RELEASE.jar!/:5.2.4.RELEASE] at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:130) ~[spring-context-5.2.4.RELEASE.jar!/:5.2.4.RELEASE] at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:706) ~[spring-context-5.2.4.RELEASE.jar!/:5.2.4.RELEASE] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:532) ~[spring-context-5.2.4.RELEASE.jar!/:5.2.4.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) ~[spring-boot-2.2.5.RELEASE.jar!/:2.2.5.RELEASE] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) ~[spring-boot-2.2.5.RELEASE.jar!/:2.2.5.RELEASE] at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) ~[spring-boot-2.2.5.RELEASE.jar!/:2.2.5.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) ~[spring-boot-2.2.5.RELEASE.jar!/:2.2.5.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) ~[spring-boot-2.2.5.RELEASE.jar!/:2.2.5.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) ~[spring-boot-2.2.5.RELEASE.jar!/:2.2.5.RELEASE] at com.yworks.example.HelloWorld.HelloWorldApplication.main(Unknown Source) ~[classes!/:0.0.1-SNAPSHOT] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na] at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na] at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na] at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48) ~[hw-ob.jar:0.0.1-SNAPSHOT] at org.springframework.boot.loader.Launcher.launch(Launcher.java:87) ~[hw-ob.jar:0.0.1-SNAPSHOT] at org.springframework.boot.loader.Launcher.launch(Launcher.java:51) ~[hw-ob.jar:0.0.1-SNAPSHOT] at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:52) ~[hw-ob.jar:0.0.1-SNAPSHOT]

Is this a known bug? Any help would be appreciated!
Attaching the pom file from BOOT-INF dir as well for reference.
pom.xml.txt

Note: The HelloWorldApplication doesn't work from the command-line without adding the below plugin step (Main class not found in manifest error):
<plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-jar-plugin</artifactId> <version>2.4</version> <configuration> <archive> <manifest> <mainClass>com.yworks.example.HelloWorld.HelloWorldApplication</mainClass> </manifest> </archive> </configuration> </plugin>

commented

Hey @Darshan-shivashankar if I'm not mistaken this is the default configuration for Maven projects. Indeed, without adding this attribute, the produced JAR will not have an entry in the manifest. Happy to see a PR to add this change.

commented

The problem is the <shrink> element in line 59 of BOOT-INF/pom.xml. Shrinking class HelloWorldApplication will remove the constructor from said class, because it is "unused". (Spring tries to instantiate HelloWorldApplication even though that is not necessary at all.)

Removing the <shrink> element will prevent the exception.

It is not necessary to add a <mainClass> attribute, the Spring Boot Maven plug-in takes care of that:

Manifest-Version: 1.0
Implementation-Title: HelloWorld
Implementation-Version: 0.0.1-SNAPSHOT
Start-Class: com.yworks.example.HelloWorld.HelloWorldApplication
Spring-Boot-Classes: BOOT-INF/classes/
Spring-Boot-Lib: BOOT-INF/lib/
Build-Jdk-Spec: 1.8
Spring-Boot-Version: 2.2.5.RELEASE
Created-By: Maven Archiver 3.4.0
Main-Class: org.springframework.boot.loader.JarLauncher

I will update the example and remove the shrink directive.