NoClassDefFoundError： Tomcat 8升级后运行时的JavacProcessing环境

Question

将项目升级到spring boot 1.5.9（spring 4.3）之后

/Q_742623943_01321512155_128635432.java:1: warning: Can't initialize javac processor due to (most likely) a class loader problem: java.lang.NoClassDefFoundError: com/sun/tools/javac/processing/JavacProcessingEnvironment
public class Q_742623943_01321512155_128635432 {
       ^
    at lombok.javac.apt.LombokProcessor.init(LombokProcessor.java:83)
    at lombok.core.AnnotationProcessor$JavacDescriptor.want(AnnotationProcessor.java:87)
    at lombok.core.AnnotationProcessor.init(AnnotationProcessor.java:140)
    at lombok.launch.AnnotationProcessorHider$AnnotationProcessor.init(AnnotationProcessor.java:69)
    at com.sun.tools.javac.processing.JavacProcessingEnvironment$ProcessorState.<init>(JavacProcessingEnvironment.java:500)
    at com.sun.tools.javac.processing.JavacProcessingEnvironment$DiscoveredProcessors$ProcessorStateIterator.next(JavacProcessingEnvironment.java:597)
    at com.sun.tools.javac.processing.JavacProcessingEnvironment.discoverAndRunProcs(JavacProcessingEnvironment.java:690)
    at com.sun.tools.javac.processing.JavacProcessingEnvironment.access$1800(JavacProcessingEnvironment.java:91)
    at com.sun.tools.javac.processing.JavacProcessingEnvironment$Round.run(JavacProcessingEnvironment.java:1035)
    at com.sun.tools.javac.processing.JavacProcessingEnvironment.doProcessing(JavacProcessingEnvironment.java:1176)
    at com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1170)
    at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:856)
    at com.sun.tools.javac.main.Main.compile(Main.java:523)
    at com.sun.tools.javac.api.JavacTaskImpl.doCall(JavacTaskImpl.java:129)
    at com.sun.tools.javac.api.JavacTaskImpl.call(JavacTaskImpl.java:138)
    at com.mysema.codegen.JDKEvaluatorFactory.compile(JDKEvaluatorFactory.java:90)
    at com.mysema.codegen.AbstractEvaluatorFactory.createEvaluator(AbstractEvaluatorFactory.java:76)
    at com.mysema.codegen.AbstractEvaluatorFactory.createEvaluator(AbstractEvaluatorFactory.java:45)
    at com.mysema.query.collections.DefaultEvaluatorFactory.create(DefaultEvaluatorFactory.java:120)
    at com.mysema.query.collections.DefaultQueryEngine.project(DefaultQueryEngine.java:218)
    at com.mysema.query.collections.DefaultQueryEngine.evaluateSingleSource(DefaultQueryEngine.java:190)
    at com.mysema.query.collections.DefaultQueryEngine.list(DefaultQueryEngine.java:82)
    at com.mysema.query.collections.AbstractColQuery.list(AbstractColQuery.java:149)

当我添加工具时，它就起作用了。jar是一个gradle依赖项，但这不是一个解决方案，因为jdk库不应该打包在项目中。

compile files(org.gradle.internal.jvm.Jvm.current().toolsJar)

我们使用的是queryDSL（2.7.3）的旧版本，该项目将生成的代码提交给repo（这是一个旧项目，我宁愿在编译时生成）。

更新：降级到tomcat后返回v7。0.*它再次开始工作。

知道tomcat 8中发生了什么变化吗？它似乎没有加载jdk libs。

Answer 1

确保Tomcat 8运行在jdk上，而不是jre上，这是因为tools.jar只是jdk的一部分。在Tomcat安装过程中，通常会选择jre。我记得早期的tomcat需要jdk来编译jsp，然后他们添加了自己的编译器，这样tomcat就可以在jre上运行。