異常的Java代理的調用通過ByteBuddy

Question

我試圖重新在威爾的blog post描述的行爲，但收到以下異常儀表上試圖通過運行它：

$ java -javaagent:agent/target/securityfixer-agent-1.0-SNAPSHOT.jar=bootstrap/target/securityfixer-bootstrap-1.0-SNAPSHOT.jar -jar example/target/securi 
tyfixer-example-1.0-SNAPSHOT.jar                               
Exception in thread "main" java.lang.NoClassDefFoundError: net/bytebuddy/implementation/Implementation$Context$Factory          
     at java.lang.Class.getDeclaredMethods0(Native Method)                        
     at java.lang.Class.privateGetDeclaredMethods(Unknown Source)                      
     at java.lang.Class.getDeclaredMethod(Unknown Source)                        
     at sun.instrument.InstrumentationImpl.loadClassAndStartAgent(Unknown Source)                  
     at sun.instrument.InstrumentationImpl.loadClassAndCallPremain(Unknown Source)                  
Caused by: java.lang.ClassNotFoundException: net.bytebuddy.implementation.Implementation$Context$Factory             
     at java.net.URLClassLoader.findClass(Unknown Source)                        
     at java.lang.ClassLoader.loadClass(Unknown Source)                         
     at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)                      
     at java.lang.ClassLoader.loadClass(Unknown Source)                         
     ... 5 more                                   
FATAL ERROR in native method: processing of -javaagent failed 

的structure是在描述威爾的博客 - 三個獨立的罐子，一個與代理人，一個與攔截器和一個與主類。

我也試着運行它通過將mainClass節到securityfixer-例子的清單可執行的JAR，但是，這似乎是完全繞過儀表：

$ java -jar example/target/securityfixer-example-1.0-SNAPSHOT.jar -javaagent:agent/target/securityfixer-agent-1.0-SNAPSHOT.jar=bootstrap/target/securityfixer-bootstrap-1.0-SNAPSHOT.jar 
Security manager is set! 
ATTACK SUCCEEDED: Security manager was reset! 

什麼可能我在這裏失去了？提前致謝。

Answer 1

下面的設置似乎工作：

byte-buddy-1.0.0.jar必須是內java-agents-experiments\securityfixer\agent\target與genarated securityfixer-agent-1.0-SNAPSHOT.jar一起，因爲後者依賴於前者。這是通過包括以下的插件，其執行復制，在securityfixer-agent/pom.xml實現：

  <plugin> 
       <groupId>org.apache.maven.plugins</groupId> 
       <artifactId>maven-dependency-plugin</artifactId> 
       <version>2.8</version> 
       <executions> 
        <execution> 
         <id>copy-dependencies</id> 
         <phase>prepare-package</phase> 
         <goals> 
          <goal>copy-dependencies</goal> 
         </goals> 
         <configuration> 
          <outputDirectory>${project.build.directory}</outputDirectory> 
          <includeScope>runtime</includeScope> 
         </configuration> 
        </execution> 
       </executions> 
      </plugin> 

以及在<Boot-Class-Path>到工件由上述節產生以下參考：

 <plugin> 
      <artifactId>maven-jar-plugin</artifactId> 
      <version>2.4</version> 
      <configuration> 
       <archive> 
        <manifestEntries> 
         <Can-Redefine-Classes>true</Can-Redefine-Classes> 
         <Can-Retransform-Classes>true</Can-Retransform-Classes> 
         <Agent-Class>com.excelsiorsoft.securityfixer.agent.SecurityFixerAgent</Agent-Class> 
         <Premain-Class>com.excelsiorsoft.securityfixer.agent.SecurityFixerAgent</Premain-Class> 
         <Boot-Class-Path>byte-buddy-1.0.0.jar</Boot-Class-Path> 
        </manifestEntries> 
       </archive> 
      </configuration> 
     </plugin> 

使不必要的依賴關係（如securityfixer-bootstrap）不會被上面的插件複製，byte-buddy-1.0.0.jar我需要將其範圍更改爲provided。 maven-dependency-plugin似乎跳過將該範圍的依賴關係複製到其目標文件夾。

爲了能夠運行爲可執行的JAR文件，我們需要將<mainClass>節添加到securityfixer-example/pom.xml：

 <plugin> 
      <artifactId>maven-jar-plugin</artifactId> 
      <version>2.4</version> 
      <configuration> 
       <archive> 
        <manifest> 
         <mainClass>securityfixer.Main</mainClass> 
        </manifest> 
       </archive> 
      </configuration> 
     </plugin> 

。

$ java -javaagent:agent/target/securityfixer-agent-1.0-SNAPSHOT.jar=bootstrap/target/securityfixer-bootstrap-1.0-SNAPSHOT.jar -jar example/target/securit yfixer-example-1.0-SNAPSHOT.jar 


Security manager is set!  
ATTACK FAILED: SecurityManager cannot be reset! 

隨意評論 - 也許有一個更優雅的解決方案。謝謝！