NullPointerException:ProGuard，Spring Boot

Question

我遇到空指针异常，不知道如何克服这个问题并混淆代码。你有什么想法吗？

我正在努力混淆一些库的[Maven]Spring启动项目与ProGuard（proGuard proGuard-maven-plugin）

堆栈跟踪：

org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal com.github.wvengen:proguard-maven-plugin:2.0.11:proguard (proguard) on project XXX: Execution proguard of goal com.github.wvengen:proguard-maven-plugin:2.0.11:proguard failed.
(...)
Caused by: org.apache.maven.plugin.PluginExecutionException: Execution proguard of goal com.github.wvengen:proguard-maven-plugin:2.0.11:proguard failed.
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:110)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
... 19 more
Caused by: java.lang.NullPointerException
at com.github.wvengen.maven.proguard.ProGuardMojo.execute(ProGuardMojo.java:506)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
... 20 more

POM构建插件：

<plugin>
 <groupId>com.github.wvengen</groupId>
 <artifactId>proguard-maven-plugin</artifactId>
 <version>2.0.11</version>
 <executions>
  <execution>
   <id>proguard</id>
   <phase>package</phase>
   <goals>
    <goal>proguard</goal>
   </goals>
  </execution>
 </executions>
 <configuration>
  <obfuscate>true</obfuscate>
  <injar>${project.build.finalName}.jar</injar>
  <outjar>${project.build.finalName}-small.jar</outjar>
  <outputDirectory>${project.build.directory}/proguard</outputDirectory>
  <proguardInclude>${basedir}/proguard.conf</proguardInclude>
  <libs>
   <lib>${java.bootstrap.classes}</lib>
   <lib>${java.cryptographic.extension.classes}</lib>
   <lib>${java.secure.socket.extension.classes}</lib>
  </libs>
  <injarNotExistsSkip>true</injarNotExistsSkip>
  <options>
 </options>
</configuration>
<dependencies>
 <dependency>
  <groupId>net.sf.proguard</groupId>
   <artifactId>proguard-base</artifactId>
   <version>5.2.1</version>
   <scope>runtime</scope>
  </dependency>
 </dependencies>
</plugin>

Answer 1

给定所提到的stackTrack，并寻找2.0.11版本插件的源代码，NullPointerExcture被抛出在这个块的ProGuardMojo类：

502     if (libs != null) {
503         for (Iterator i = libs.iterator(); i.hasNext();) {
504             Object lib = i.next();
505             args.add("-libraryjars");
506             args.add(fileNameToString(lib.toString()));
507         }
508     }

这意味着很可能是lib。toString（）是对null引用的方法调用。

从你提到的插件配置中，我们可以看到：

<libs>
   <lib>${java.bootstrap.classes}</lib>
   <lib>${java.cryptographic.extension.classes}</lib>
   <lib>${java.secure.socket.extension.classes}</lib>
</libs>

因此，这些Maven属性中很可能有一个未设置，作为空/null传递，并导致错误。

您应该检查这些属性是否具有有效值，或者是否应该从命令行传递，事实并非如此。