当我不断收到 HTTP ERROR 500 Z93F725A07423FE1C889F448B33D21.

Question

在成功构建和增强步骤之后，我希望 JPA 和 Datanucleus 插件能够顺利工作。 但是当我运行 App Engine 本地开发服务器时，我得到了 java.lang.VerifyError。 有解决办法吗？

增强结果：

[datanucleusenhancer] INFO: DataNucleus Enhancer (version 3.0.1) : Enhancement of classes
[datanucleusenhancer] Dec 14, 2020 10:19:38 AM org.datanucleus.enhancer.AbstractClassEnhancer save
[datanucleusenhancer] INFO: Writing class file "/home/*****/Documents/AppEngineApps/java/*******/war/WEB-INF/classes/model/Category.class" with enhanced definition
[datanucleusenhancer] DataNucleus Enhancer completed with success for 1 classes. Timings : input=134 ms, enhance=43 ms, total=177 ms. Consult the log for full details
[datanucleusenhancer] Dec 14, 2020 10:19:38 AM org.datanucleus.enhancer.DataNucleusEnhancer addMessage
[datanucleusenhancer] INFO: DataNucleus Enhancer completed with success for 1 classes. Timings : input=134 ms, enhance=43 ms, total=177 ms. Consult the log for full details

系统信息

# java -version
openjdk version "1.8.0_272"
OpenJDK Runtime Environment (build 1.8.0_272-b10)
OpenJDK 64-Bit Server VM (build 25.272-b10, mixed mode)

# gcloud --version
Google Cloud SDK 319.0.0
alpha 2020.11.13
app-engine-java 1.9.83
app-engine-python 1.9.91
app-engine-python-extras 1.9.91
beta 2020.11.13
bigtable
bq 2.0.62
cbt 0.9.0
cloud-build-local 0.5.2
cloud-datastore-emulator 2.1.0
core 2020.11.13
datalab 20190610
gsutil 4.55
kubectl 1.16.13

Ant 构建文件中的增强片段

<path location="${lib.dir}/datanucleus-enhancer-3.0.1.jar"
        id="tools.class.path" />

<path id="enhancer.classpath">
    <fileset dir="${lib.dir}">
        <include name="**/*.jar" />
    </fileset>
   <pathelement location="${class.dir}" />
</path>

<target name="datanucleusenhance" depends="compile"
        description="DataNucleus enhancement">
    <taskdef name="datanucleusenhancer" classpathref="enhancer.classpath"
            classname="org.datanucleus.enhancer.tools.EnhancerTask" />

    <datanucleusenhancer failonerror="true" api="JPA">
        <classpath>
            <path refid="enhancer.classpath" />
        </classpath>
       
        <fileset dir="${class.dir}">
            <include name="model/*.class" />
        </fileset>
    </datanucleusenhancer>
</target>

错误

Caused by:
java.lang.VerifyError: Expecting a stackmap frame at branch target 16
Exception Details:
  Location:
    model/Category.jdoIsDetached()Z @4: ifnonnull
  Reason:
    Expected stackmap frame at this location.
  Bytecode:
    0x0000000: 2ab4 00a5 c700 0c2a b400 b1c6 0005 04ac
    0x0000010: 03ac                                  

lib目录的内容

war/WEB-INF/lib/appengine-api.jar
war/WEB-INF/lib/appengine-api-labs.jar
war/WEB-INF/lib/appengine-jsr107cache-0.0.0.jar
war/WEB-INF/lib/appengine-tools-api.jar
war/WEB-INF/lib/asm-3.3.1.jar
war/WEB-INF/lib/datanucleus-api-jpa-3.0.6.jar
war/WEB-INF/lib/datanucleus-appengine-2.0.0-final.jar
war/WEB-INF/lib/datanucleus-core-3.0.6.jar
war/WEB-INF/lib/datanucleus-enhancer-3.0.1.jar
war/WEB-INF/lib/geronimo-jpa_2.0_spec-1.0.jar
war/WEB-INF/lib/jdo-api-3.0.jar
war/WEB-INF/lib/jsr107cache-1.1.jar
war/WEB-INF/lib/org.apache.taglibs.taglibs-standard-impl-1.2.5.jar
war/WEB-INF/lib/org.apache.taglibs.taglibs-standard-spec-1.2.5.jar
war/WEB-INF/lib/servlet-api-3.1.jar
war/WEB-INF/lib/transaction-api-1.1.jar

Answer 1

我发现Google提供的用于增强的jars已经过时了。 这就是增强类无法通过较新 JVM 的字节码验证的原因。 解决方案是从 Maven 存储库下载最新版本的datanucleus-appengine.jar及其所有依赖项的最新版本：依赖项显示在下载页面上。 这对我来说非常有效。