奇怪的 JPA 编译错误答案

【问题标题】：Strange JPA compilation errors奇怪的 JPA 编译错误
【发布时间】：2015-03-21 01:34:51
【问题描述】：

尝试使用 JPA 2.1 和 EclipseLink 2.6 时出现以下编译错误

em.getCriteriaBuilder()

java: 找不到符号符号：方法 getCriteriaBuilder() 位置：javax.persistence.EntityManager 类型的变量 em

Expression<Boolean>

java：类型 javax.persistence.criteria.Expression 不带参数

TypedQuery<Foo> query = em.createQuery(queryString, Foo.class);

java：接口 javax.persistence.EntityManager 中的方法 createQuery 不能应用于给定类型；必需：java.lang.String 找到：java.lang.String,java.lang.Class 原因：实际参数列表和形式参数列表的长度不同

我的 pom.xml 包含以下 JPA 依赖项

    <dependency>
        <groupId>org.eclipse.persistence</groupId>
        <artifactId>javax.persistence</artifactId>
        <version>2.1.0</version>
    </dependency>
    <dependency>
        <groupId>org.eclipse.persistence</groupId>
        <artifactId>eclipselink</artifactId>
        <version>2.6.0</version>
    </dependency>

我只能认为编译器使用的是不同的 JPA 版本，而我在上面尝试使用的此类方法不存在。但是 pom 显然包含 2.1 的实现。

当我尝试将非 maven 项目转换为 Intellij IDEA maven 项目时，会发生这些编译错误（因此之前一切正常）。

完整的 pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

<modelVersion>4.0.0</modelVersion>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>

<groupId>REDACTED</groupId>
<artifactId>REDACTED</artifactId>

<properties>
    <appengine.app.version>1</appengine.app.version>
    <appengine.target.version>1.7.5</appengine.target.version>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>

<dependencies>
    <!-- Compile/runtime dependencies -->
    <dependency>
        <groupId>com.google.appengine</groupId>
        <artifactId>appengine-api-1.0-sdk</artifactId>
        <version>${appengine.target.version}</version>
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>servlet-api</artifactId>
        <version>2.5</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>jstl</groupId>
        <artifactId>jstl</artifactId>
        <version>1.2</version>
    </dependency>
    <dependency>
        <groupId>org.eclipse.persistence</groupId>
        <artifactId>javax.persistence</artifactId>
        <version>2.1.0</version>
    </dependency>
    <dependency>
        <groupId>org.eclipse.persistence</groupId>
        <artifactId>eclipselink</artifactId>
        <version>2.6.0</version>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.6</version>
    </dependency>
    <dependency>
        <groupId>javax.ws.rs</groupId>
        <artifactId>javax.ws.rs-api</artifactId>
        <version>2.0.1</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jersey.containers</groupId>
        <!-- if your container implements Servlet API older than 3.0, use "jersey-container-servlet-core"  -->
        <artifactId>jersey-container-servlet</artifactId>
        <version>2.17</version>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jersey.ext</groupId>
        <artifactId>jersey-mvc</artifactId>
        <version>2.17</version>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-core</artifactId>
        <version>2.5.1</version>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>2.5.1</version>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-annotations</artifactId>
        <version>2.5.1</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.security</groupId>
        <artifactId>spring-security-web</artifactId>
        <version>3.2.6.RELEASE</version>
    </dependency>

    <!-- Test Dependencies -->
    <dependency>
        <groupId>com.google.appengine</groupId>
        <artifactId>appengine-testing</artifactId>
        <version>${appengine.target.version}</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>com.google.appengine</groupId>
        <artifactId>appengine-api-stubs</artifactId>
        <version>${appengine.target.version}</version>
        <scope>test</scope>
    </dependency>
</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <version>2.5.1</version>
            <artifactId>maven-compiler-plugin</artifactId>
            <configuration>
                <source>1.7</source>
                <target>1.7</target>
            </configuration>
        </plugin>

        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-war-plugin</artifactId>
            <version>2.3</version>
            <configuration>
                <archiveClasses>true</archiveClasses>
                <webResources>
                    <!-- in order to interpolate version from pom into appengine-web.xml -->
                    <resource>
                        <directory>${basedir}/src/main/webapp/WEB-INF</directory>
                        <filtering>true</filtering>
                        <targetPath>WEB-INF</targetPath>
                    </resource>
                </webResources>
            </configuration>
        </plugin>

        <plugin>
            <groupId>com.google.appengine</groupId>
            <artifactId>appengine-maven-plugin</artifactId>
            <version>${appengine.target.version}</version>
        </plugin>
    </plugins>
</build>

编辑：运行 mvn 依赖的结果：树

[INFO] --- maven-dependency-plugin:2.1:tree (default-cli) @ REDACTED ---
[INFO] REDACTED:war:0.0.1-SNAPSHOT
[INFO] +- com.google.appengine:appengine-api-1.0-sdk:jar:1.7.5:compile
[INFO] +- javax.servlet:servlet-api:jar:2.5:provided (scope not updated to 
compile)
[INFO] +- jstl:jstl:jar:1.2:compile
[INFO] +- org.eclipse.persistence:javax.persistence:jar:2.1.0:compile
[INFO] +- org.eclipse.persistence:eclipselink:jar:2.6.0:compile
[INFO] |  +- org.eclipse.persistence:commonj.sdo:jar:2.1.1:compile
[INFO] |  +- javax.validation:validation-api:jar:1.1.0.Final:compile
[INFO] |  \- org.glassfish:javax.json:jar:1.0.4:compile
[INFO] +- mysql:mysql-connector-java:jar:5.1.6:compile
[INFO] +- javax.ws.rs:javax.ws.rs-api:jar:2.0.1:provided (scope not updated to compile)
[INFO] +- org.glassfish.jersey.containers:jersey-container-servlet:jar:2.17:compile
[INFO] |  +- org.glassfish.jersey.containers:jersey-container-servlet-core:jar:2.17:compile
[INFO] |  |  \- org.glassfish.hk2.external:javax.inject:jar:2.4.0-b10:compile
[INFO] |  +- org.glassfish.jersey.core:jersey-common:jar:2.17:compile
[INFO] |  |  +- javax.annotation:javax.annotation-api:jar:1.2:compile
[INFO] |  |  +- org.glassfish.jersey.bundles.repackaged:jersey-guava:jar:2.17:compile
[INFO] |  |  +- org.glassfish.hk2:hk2-api:jar:2.4.0-b10:compile
[INFO] |  |  |  +- org.glassfish.hk2:hk2-utils:jar:2.4.0-b10:compile
[INFO] |  |  |  \- org.glassfish.hk2.external:aopalliance-repackaged:jar:2.4.0-b10:compile
[INFO] |  |  +- org.glassfish.hk2:hk2-locator:jar:2.4.0-b10:compile
[INFO] |  |  |  \- org.javassist:javassist:jar:3.18.1-GA:compile
[INFO] |  |  \- org.glassfish.hk2:osgi-resource-locator:jar:1.0.1:compile
[INFO] |  \- org.glassfish.jersey.core:jersey-server:jar:2.17:compile
[INFO] |     +- org.glassfish.jersey.core:jersey-client:jar:2.17:compile
[INFO] |     \- org.glassfish.jersey.media:jersey-media-jaxb:jar:2.17:compile
[INFO] +- org.glassfish.jersey.ext:jersey-mvc:jar:2.17:compile
[INFO] +- com.fasterxml.jackson.core:jackson-core:jar:2.5.1:compile
[INFO] +- com.fasterxml.jackson.core:jackson-databind:jar:2.5.1:compile
[INFO] +- com.fasterxml.jackson.core:jackson-annotations:jar:2.5.1:compile
[INFO] +- org.springframework.security:spring-security-web:jar:3.2.6.RELEASE:compile
[INFO] |  +- aopalliance:aopalliance:jar:1.0:compile
[INFO] |  +- org.springframework.security:spring-security-core:jar:3.2.6.RELEASE:compile
[INFO] |  |  \- org.springframework:spring-aop:jar:3.2.8.RELEASE:compile
[INFO] |  +- org.springframework:spring-beans:jar:3.2.8.RELEASE:compile
[INFO] |  +- org.springframework:spring-context:jar:3.2.8.RELEASE:compile
[INFO] |  +- org.springframework:spring-core:jar:3.2.8.RELEASE:compile
[INFO] |  +- org.springframework:spring-expression:jar:3.2.8.RELEASE:compile
[INFO] |  \- org.springframework:spring-web:jar:3.2.8.RELEASE:compile
[INFO] +- com.google.appengine:appengine-testing:jar:1.7.5:test
[INFO] \- com.google.appengine:appengine-api-stubs:jar:1.7.5:test
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------

【问题讨论】：

你可以运行mvn dependency:tree，它会告诉你是否有不正确的依赖项进入
@Raghuram 我运行了命令并发布了结果。似乎没有什么矛盾的。
我刚刚测试了您的pom.xml（在 Eclipse 中），一切正常。您是否尝试过从 IntelliJ IDEA 更新 Maven 项目？

标签： java maven jpa

【解决方案1】：

我认为 Intellij IDEA 的 Google App Engine 和 Maven Facets 不兼容。我选择从 com.google.appengine.archetypes 的骨架原型创建项目，并忽略了 GAE IDE 集成功能。这解决了编译错误。

【讨论】：