我尝试使用 JDO 将一个谷歌云项目从端点 v1 迁移到 v2。我已经按照迁移指南和此处的一些解决方案尝试使 datanucleous 插件增强我的类,并将它们上传到谷歌云,但没有运气。
我将发布 build.gradle,然后在客户端尝试连接到端点时返回服务器错误,这是一个 NoClassFound 错误。
build.gradle:
buildscript {
repositories {
mavenCentral()
mavenLocal()
}
dependencies {
// App Engine Gradle plugin
classpath 'com.google.cloud.tools:appengine-gradle-plugin:1.3.3'
// Endpoints Frameworks Gradle plugin
classpath 'com.google.cloud.tools:endpoints-framework-gradle-plugin:1.0.2'
}
}
repositories {
mavenCentral();
jcenter()
}
apply plugin: 'java'
apply plugin: 'war'
// [START apply_plugins]
apply plugin: 'com.google.cloud.tools.appengine'
apply plugin: 'com.google.cloud.tools.endpoints-framework-server'
// [END apply_plugins]
dependencies {
compile ('com.google.endpoints:endpoints-framework:2.0.8') {
exclude group: 'com.google.guava', module: 'guava-jdk5'
}
compile 'javax.servlet:servlet-api:2.5'
compile 'com.ganyo:gcm-server:1.0.2'
compile 'javax.jdo:jdo-api:3.0.1'
compile 'org.datanucleus:datanucleus-core:3.1.3'
compile 'org.datanucleus:datanucleus-api-jdo:3.1.3'
compile 'org.datanucleus:datanucleus-accessplatform-jdo-rdbms:4.1.1'
compile 'com.google.appengine.orm:datanucleus-appengine:2.1.2'
compile 'com.google.code.gson:gson:2.2.4'
compile 'org.apache.commons:commons-lang3:3.5'
}
sourceCompatibility = JavaVersion.VERSION_1_7
targetCompatibility = JavaVersion.VERSION_1_7
appengine { // App Engine tasks configuration
deploy { // deploy configuration
version = findProperty("appengine.deploy.version")
def promoteProp = findProperty("appengine.deploy.promote")
if (promoteProp != null) {
promote = new Boolean(promoteProp)
}
}
}
endpointsServer {
// Endpoints Framework Plugin server-side configuration
hostname = "komilibro.appspot.com"
}
task datanucleusEnhance {
description "Enhance JDO model classes using DataNucleus Enhancer"
dependsOn processResources
doLast {
// define the entity classes
def entityFiles = fileTree(sourceSets.main.output.classesDir).matching {
include 'com/meanwhile/komi/head/**/*.class'
}
println "Enhancing with DataNucleus the following files"
entityFiles.getFiles().each {
println it
}
// define Ant task for DataNucleus Enhancer
ant.taskdef(
name : 'datanucleusenhancer',
classpath : sourceSets.main.runtimeClasspath.asPath,
classname : 'org.datanucleus.enhancer.EnhancerTask'
// the below is for DataNucleus Enhancer 3.1.1
//classname : 'org.datanucleus.enhancer.tools.EnhancerTask'
)
// run the DataNucleus Enhancer as an Ant task
ant.datanucleusenhancer(
classpath: sourceSets.main.runtimeClasspath.asPath,
verbose: true,
api: "JDO") {
entityFiles.addToAntBuilder(ant, 'fileset', FileCollection.AntType.FileSet)
}
}
}
classes.dependsOn(datanucleusEnhance)
在用户请求后查看服务器日志,我可以看到两个错误: 第一:
org.datanucleus.store.types.TypeManagerImpl loadJavaTypes: User-defined type
mapping class "org.datanucleus.store.types.sco.simple.Collection" was not found.
Please check the mapping file class specifications and your CLASSPATH. The class
must be in the CLASSPATH.
这是第二个。 PMF 只是一个用于加载和实例化 PersistenceManager 的类。
com.google.api.server.spi.SystemService invokeServiceMethod: exception occurred while calling backend method (SystemService.java:375)
java.lang.NoClassDefFoundError: Could not initialize class com.meanwhile.komi.head.PMF
所以,似乎所需的类没有到位,而且 TypeManagerImpl 也没有找到 Collection 类(在端点中使用默认的 java Collection)。我在这里有点迷路,所以非常欢迎帮助。
谢谢!
最佳答案
将此添加到您的 gradle 构建文件中:
task datanucleusEnhance {
description "Enhance JDO model classes using DataNucleus Enhancer"
dependsOn compileJava
doLast {
// define the entity classes
def entityFiles = fileTree(sourceSets.main.output.classesDir).matching {
include 'com/mycom/*.class', 'org/myorg/*.class'
}
println "Enhancing with DataNucleus the following files"
entityFiles.getFiles().each {
println it
}
// define Ant task for DataNucleus Enhancer
ant.taskdef(
name : 'datanucleusenhancer',
classpath : sourceSets.main.runtimeClasspath.asPath,
classname : 'org.datanucleus.enhancer.EnhancerTask'
// the below is for DataNucleus Enhancer 3.1.1
//classname : 'org.datanucleus.enhancer.tools.EnhancerTask'
)
// run the DataNucleus Enhancer as an Ant task
ant.datanucleusenhancer(
classpath: sourceSets.main.runtimeClasspath.asPath,
verbose: true,
api: "JDO") {
entityFiles.addToAntBuilder(ant, 'fileset', FileCollection.AntType.FileSet)
}
}
}
classes.dependsOn(datanucleusEnhance)
entityFiles 是您配置 JPA 实体注释类的地方。
关于java - 将 JDO 项目迁移到 google cloud endpoints v2,服务器返回 NoClassDefFoundError,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/51808819/