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如何使用 Maven 在构建时正确增强类？ OpenJPA

2024-04-15

我在尝试着enhance（实体）类，所以我不会得到这个异常：

Exception in thread "main" <openjpa-3.1.2-r66d2a72 nonfatal user error> org.apache.op
enjpa.persistence.ArgumentException: Attempt to cast instance "entities.EntityPerson@
6dba847b" to PersistenceCapable failed.  Ensure that it has been enhanced.
FailedObject: entities.EntityPerson@6dba847b
    at org.apache.openjpa.kernel.BrokerImpl.assertPersistenceCapable(BrokerImpl.java:486
3)
    at org.apache.openjpa.kernel.BrokerImpl.persistInternal(BrokerImpl.java:2762)
    at org.apache.openjpa.kernel.BrokerImpl.persist(BrokerImpl.java:2707)
    at org.apache.openjpa.kernel.BrokerImpl.persist(BrokerImpl.java:2690)
    at org.apache.openjpa.kernel.BrokerImpl.persist(BrokerImpl.java:2592)
    at org.apache.openjpa.kernel.DelegatingBroker.persist(DelegatingBroker.java:1197)
    at org.apache.openjpa.persistence.EntityManagerImpl.persist(EntityManagerImpl.java:8
37)
    at openjpa.Test/main.Main.main(Main.java:23)

说我试图坚持的实例不是enhanced.

我已经遵循了这个：https://openjpa.apache.org/enhancement-with-maven.html https://openjpa.apache.org/enhancement-with-maven.html官方 openjpa 页面并添加openjpa-maven-plugin到我的 pom.xml 部分：

<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>registry</groupId>
    <artifactId>datalayer</artifactId>
    <version>0.0.1</version>
    <packaging>jar</packaging>

    <properties>
        <maven.compiler.target>11</maven.compiler.target>
        <maven.compiler.source>11</maven.compiler.source>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.sourceEncoding>UTF-8</project.reporting.sourceEncoding>
    </properties>

    <build>
        <pluginManagement>
            <plugins>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>3.8.1</version>
                </plugin>
                <plugin>
                    <groupId>org.apache.openjpa</groupId>
                    <artifactId>openjpa-maven-plugin</artifactId>
                    <version>3.1.2</version>
                    <configuration>
                        <includes>datalayer/dto/*.class</includes>
                        <addDefaultConstructor>true</addDefaultConstructor>
                        <enforcePropertyRestrictions>true</enforcePropertyRestrictions>
                    </configuration>
                    <executions>
                        <execution>
                            <id>enhancer</id>
                            <phase>process-classes</phase>
                            <goals>
                                <goal>enhance</goal>
                            </goals>
                        </execution>
                    </executions>
                </plugin>
            </plugins>
        </pluginManagement>
    </build>

    <dependencies>
        <dependency>
            <groupId>org.apache.openjpa</groupId>
            <artifactId>openjpa</artifactId>
            <version>3.1.2</version>
        </dependency>
        <dependency>
            <groupId>org.apache.derby</groupId>
            <artifactId>derby</artifactId>
            <version>10.15.2.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.derby</groupId>
            <artifactId>derbytools</artifactId>
            <version>10.15.2.0</version>
        </dependency>
    </dependencies>
</project>

，但我仍然得到这个例外。我正在使用 Eclipse 并内置命令Run As -> Maven install。我也尝试过跑步mvn install从命令行。然后我只是尝试使用来持久化一些实体EntityManager.

Running mvn install使用和不使用 openjpa-maven-plugin 都不会改变任何东西（使用相同的 .class 文件生成相同的 .jar，相同的 Maven 输出到控制台）

正如答案所说，我需要跑openjpa:enhance使用 Maven 构建时的目标。我事实上没有使用openjpa-maven-plugin，所以我解决了这个问题。Maven 输出：

[INFO] Error stacktraces are turned on.
[INFO] Scanning for projects...
[INFO] 
[INFO] -------------------------< registry:datalayer >-------------------------
[INFO] Building datalayer 0.0.1
[INFO] --------------------------------[ jar ]---------------------------------
[INFO] 
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ datalayer ---
[INFO] Deleting C:\Users\wortigson\Desktop\ISMatrikaBcWorkspace\Openjpa.Test\target
[INFO] 
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ datalayer ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource
[INFO] 
[INFO] --- maven-compiler-plugin:3.8.1:compile (default-compile) @ datalayer ---
[WARNING] Can't extract module name from geronimo-jms_1.1_spec-1.1.1.jar: geronimo.jm
s.1.1.spec: Invalid module name: '1' is not a Java identifier
[WARNING] Can't extract module name from geronimo-jta_1.1_spec-1.1.1.jar: geronimo.jt
a.1.1.spec: Invalid module name: '1' is not a Java identifier
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 3 source files to C:\Users\wortigson\Desktop\ISMatrikaBcWorkspace\Op
enjpa.Test\target\classes
[INFO] 
[INFO] --- openjpa-maven-plugin:3.1.2:enhance (default-cli) @ datalayer ---
130  DataLayer  INFO   [main] openjpa.Tool - Enhancer running on type "class entities
.EntityPerson".
[INFO] 
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ datalayer ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource
[INFO] 
[INFO] --- maven-compiler-plugin:3.8.1:compile (default-compile) @ datalayer ---
[WARNING] Can't extract module name from geronimo-jms_1.1_spec-1.1.1.jar: geronimo.jm
s.1.1.spec: Invalid module name: '1' is not a Java identifier
[WARNING] Can't extract module name from geronimo-jta_1.1_spec-1.1.1.jar: geronimo.jt
a.1.1.spec: Invalid module name: '1' is not a Java identifier
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 3 source files to C:\Users\wortigson\Desktop\ISMatrikaBcWorkspace\Op
enjpa.Test\target\classes
[INFO] 
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ datalay
er ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 0 resource
[INFO] 
[INFO] --- maven-compiler-plugin:3.8.1:testCompile (default-testCompile) @ datalayer 
---
[WARNING] Can't extract module name from geronimo-jta_1.1_spec-1.1.1.jar: geronimo.jt
a.1.1.spec: Invalid module name: '1' is not a Java identifier
[WARNING] Can't extract module name from geronimo-jms_1.1_spec-1.1.1.jar: geronimo.jm
s.1.1.spec: Invalid module name: '1' is not a Java identifier
[INFO] Changes detected - recompiling the module!
[INFO] 
[INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ datalayer ---
[INFO] 
[INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ datalayer ---
[INFO] Building jar: C:\Users\wortigson\Desktop\ISMatrikaBcWorkspace\Openjpa.Test\tar
get\datalayer-0.0.1.jar
[INFO] 
[INFO] --- maven-install-plugin:2.4:install (default-install) @ datalayer ---
[INFO] Installing C:\Users\wortigson\Desktop\ISMatrikaBcWorkspace\Openjpa.Test\target
\datalayer-0.0.1.jar to C:\Users\wortigson\.m2\repository\registry\datalayer\0.0.1\da
talayer-0.0.1.jar
[INFO] Installing C:\Users\wortigson\Desktop\ISMatrikaBcWorkspace\Openjpa.Test\pom.xm
l to C:\Users\wortigson\.m2\repository\registry\datalayer\0.0.1\datalayer-0.0.1.pom
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS

您可以看到我在 EntityPerson 类上运行增强器，这是我测试过的简单 JPA 实体。但是我仍然得到那个异常。我注意到 maven-compiler-plugin:3.8.1:compile运行两次。之前和之后openjpa-maven-plugin:3.1.2:enhance- 这可能是个问题吗？

我认为这不是我的情况：如何在构建时使用 openJPA 从单独的 jar 中增强类？ https://stackoverflow.com/questions/32229585/how-to-enhance-a-class-from-a-separate-jar-at-build-time-with-openjpa

发现有解决办法尝试将实例强制转换为 PersistenceCapable 失败。确保它已得到增强 https://stackoverflow.com/questions/4102294/attempt-to-cast-instance-to-persistencecapable-failed-ensure-that-its-been-enh通过按照接受的答案在配置中设置某些属性，但我不想那样做，因为第一条评论说不建议这样做，并指向官方 openjpa 页面，我在其中找到了如何在 Maven 构建期间增强类的示例时间，但正如我所写，它不起作用。

测试主要方法：

public static void main(String[] args)
    {
        HashMap<String, String> jpaProps = new HashMap<String, String>();
        jpaProps.put("javax.persistence.jdbc.url", "jdbc:derby:testDB;create=true");
        EntityManagerFactory factory = Persistence.createEntityManagerFactory("DataLayer", jpaProps);
        EntityManager manager = factory.createEntityManager();
        EntityPerson person = new EntityPerson();
        person.setAge(25);
        person.setName("Andrej Hruska");
        manager.persist(person); // +
    }

实体人类：

package entities;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;

@Entity
public class EntityPerson
{
    @Id
    @GeneratedValue
    private long id;
    
    @Column(nullable = false)
    private String name;
    
    private int age;

    public long getId()
    {
        return id;
    }

    public void setId(long id)
    {
        this.id = id;
    }

    public String getName()
    {
        return name;
    }

    public void setName(String name)
    {
        this.name = name;
    }

    public int getAge()
    {
        return age;
    }

    public void setAge(int age)
    {
        this.age = age;
    }
}

持久性.xml：

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.2"
    xmlns="http://xmlns.jcp.org/xml/ns/persistence"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence https://www.oracle.com/webfolder/technetwork/jsc/xml/ns/persistence/persistence_2_2.xsd">
    <persistence-unit name="DataLayer"
        transaction-type="RESOURCE_LOCAL">
        <non-jta-data-source>DataSource</non-jta-data-source>
        <properties>
            <property
                name="javax.persistence.schema-generation.database.action"
                value="create" />
            <property name="javax.persistence.jdbc.driver"
                value="org.apache.derby.jdbc.EmbeddedDriver" />
            <property name="javax.persistence.jdbc.url"
                value="jdbc:derby:db;create=true" />
        </properties>
    </persistence-unit>
</persistence>

项目结构：

重现步骤：

  1. Eclipse 中的 Crete Maven 项目
  2. 复制我的 pom.xml （或将依赖项添加到 derby、openjpa 并设置 openjpa-maven-plugin、名称和路径）
  3. 复制我的 persistence.xml （或使用一些持久性单元创建您自己的）
  4. 复制我的 EntityPerson 类（或创建简单的 JPA 实体来测试它）
  5. 运行 mvn clean compile openjpa:enhance install （重要部分是 openjpa:enhance）
  6. 尝试像我在主要方法中所做的那样保留实体

将插件定义移至 from<pluginManagement> to <plugins> like

<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>registry</groupId>
    <artifactId>datalayer</artifactId>
    <version>0.0.1</version>
    <packaging>jar</packaging>

    <properties>
        <maven.compiler.target>11</maven.compiler.target>
        <maven.compiler.source>11</maven.compiler.source>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.sourceEncoding>UTF-8</project.reporting.sourceEncoding>
    </properties>

    <build>
        <pluginManagement>
            <plugins>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>3.8.1</version>
                </plugin>
            </plugins>
        </pluginManagement>
        <plugins>
                <plugin>
                    <groupId>org.apache.openjpa</groupId>
                    <artifactId>openjpa-maven-plugin</artifactId>
                    <version>3.1.2</version>
                    <configuration>
                        <includes>datalayer/dto/*.class</includes>
                        <addDefaultConstructor>true</addDefaultConstructor>
                        <enforcePropertyRestrictions>true</enforcePropertyRestrictions>
                    </configuration>
                    <executions>
                        <execution>
                            <id>enhancer</id>
                            <phase>process-classes</phase>
                            <goals>
                                <goal>enhance</goal>
                            </goals>
                        </execution>
                    </executions>
                </plugin>
       </plugins>
    </build>

    <dependencies>
        <dependency>
            <groupId>org.apache.openjpa</groupId>
            <artifactId>openjpa</artifactId>
            <version>3.1.2</version>
        </dependency>
        <dependency>
            <groupId>org.apache.derby</groupId>
            <artifactId>derby</artifactId>
            <version>10.15.2.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.derby</groupId>
            <artifactId>derbytools</artifactId>
            <version>10.15.2.0</version>
        </dependency>
    </dependencies>
</project>

PluginManagement 仅用于配置——插件不会自动运行。

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