我有一個我無法解決的問題。我需要你的幫助來解決問題。我有兩個專案，“sampleZkProject”和“institutiongeography”。兩者都是 Maven 專案。它們在 Java 8 上運行。
“sampleZkProject”是一個從 web 層負責的示例 zk 專案。它需要與制度地理學相互作用。機構地理是一個pom型別的maven專案。Institutionalgeography 使用hibernate 作為ORM 框架。機構地理學已經通過了測驗，因此我們可以通過置信區間知道它運行良好。
“sampleZkProject”的pom結構如下：
<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>
<groupId>experimental.tahasozgen.zk</groupId>
<artifactId>ornek1</artifactId>
<version>0.0.1-SNAPSHOT</version>
<properties>
<zk.version>9.6.0</zk.version>
<commons-io>2.6</commons-io>
<maven.build.timestamp.format>yyyy-MM-dd</maven.build.timestamp.format>
<packname>-${project.version}-FL-${maven.build.timestamp}</packname>
</properties>
<packaging>war</packaging>
<name>The ornek1 Project</name>
<description>The ornek1 Project</description>
<licenses>
<license>
<name>GNU LESSER GENERAL PUBLIC LICENSE, Version 3</name>
<url>https://www.gnu.org/licenses/lgpl.html</url>
<distribution>repo</distribution>
</license>
</licenses>
<repositories>
<repository>
<id>ZK CE</id>
<name>ZK CE Repository</name>
<url>https://mavensync.zkoss.org/maven2</url>
</repository>
<repository>
<id>ZK EVAL</id>
<name>ZK Evaluation Repository</name>
<url>https://mavensync.zkoss.org/eval</url>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>zkmaven</id>
<name>ZK Maven Plugin Repository</name>
<url>https://mavensync.zkoss.org/maven2/</url>
</pluginRepository>
</pluginRepositories>
<dependencies>
<dependency>
<groupId>org.zkoss.zk</groupId>
<artifactId>zkbind</artifactId>
<version>${zk.version}</version>
</dependency>
<dependency>
<groupId>org.zkoss.zk</groupId>
<artifactId>zul</artifactId>
<version>${zk.version}</version>
</dependency>
<dependency>
<groupId>org.zkoss.zk</groupId>
<artifactId>zkplus</artifactId>
<version>${zk.version}</version>
</dependency>
<dependency>
<groupId>org.zkoss.zk</groupId>
<artifactId>zhtml</artifactId>
<version>${zk.version}</version>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>${commons-io}</version>
</dependency>
<!--other dependencies-->
<dependency>
<groupId>com.tahasozgen.institutiongeography</groupId>
<artifactId>institutiongeography-core</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>com.tahasozgen.institutiongeography</groupId>
<artifactId>institutiongeography-entities</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>com.tahasozgen.institutiongeography</groupId>
<artifactId>institutiongeography-repository</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>com.tahasozgen.institutiongeography</groupId>
<artifactId>institutiongeography-businesslayer</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>com.tahasozgen.institutiongeography</groupId>
<artifactId>institutiongeography-contracts</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>com.tahasozgen.institutiongeography</groupId>
<artifactId>institutiongeography-service</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>5.4.27.Final</version>
</dependency>
</dependencies>
<build>
<finalName>${project.artifactId}</finalName>
<plugins>
<!-- Run with Jetty -->
<plugin>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-maven-plugin</artifactId>
<version>10.0.5</version>
<configuration>
<webApp>
<contextPath>/${project.artifactId}</contextPath>
<allowDuplicateFragmentNames>true</allowDuplicateFragmentNames>
</webApp>
<scanIntervalSeconds>5</scanIntervalSeconds>
</configuration>
</plugin>
<!-- Compile java -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>
<configuration>
<source>8</source>
<target>8</target>
</configuration>
</plugin>
<!-- Build war -->
<plugin>
<artifactId>maven-war-plugin</artifactId>
<groupId>org.apache.maven.plugins</groupId>
<version>3.3.1</version>
</plugin>
<!-- Pack zips -->
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<version>2.2</version>
<executions>
<execution>
<id>webapp</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
<configuration>
<finalName>ornek1${packname}</finalName>
<appendAssemblyId>false</appendAssemblyId>
<descriptors>
<descriptor>src/main/assembly/webapp.xml</descriptor>
</descriptors>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
sampleZkProject 有一個類負責與機構地理互動。這個類的結構如下：
package experimental.tahasozgen.zk.ornek1;
import java.util.HashMap;
import org.zkoss.bind.annotation.Command;
import org.zkoss.bind.annotation.Destroy;
import org.zkoss.bind.annotation.Init;
import org.zkoss.bind.annotation.NotifyChange;
import experimental.tahasozgen.institutiongeography.contracts.abstracts.institutionmanagement.InstitutionService;
public class MyViewModel {
private InstitutionService institutionService;
private int count;
@Init
public void init() {
count = 100;
institutionService = experimental.tahasozgen.institutiongeography.service.dependencymanagement.DependencyResolver.getSample().resolve(InstitutionService.class);
System.out.println(String.format("is institutionService empty? %b", institutionService ==null));
}
/*other functions*/
}
Experimental.tahasozgen.institutiongeography.service.dependencymanagement.DependencyResolver.getSample().resolve(Class classInstance)
is a java function that resolves the InstitutionService at runtime. When it tries to resolve it, it runs the below:
private EntityManagerFactory createEntityManagerFactory() {
return new EntityManagerFactory();
}
The definition of the EntityManagerFactory is as follows:
package experimental.tahasozgen.institutiongeography.businesslayer.dependencyresolvers;
package experimental.tahasozgen.institutiongeography.businesslayer.dependencyresolvers;
//import java.util.concurrent.BlockingQueue;
//import java.util.concurrent.LinkedBlockingQueue;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.hibernate.jpa.HibernatePersistenceProvider;
import experimental.tahasozgen.institutiongeography.core.crosscuttingconcern.exceptions.ExceptionAffairs;
import experimental.tahasozgen.institutiongeography.core.dataccess.entityframework.IEntityManagerFactory;
class EntityManagerFactory implements IEntityManagerFactory {
private static EntityManagerFactory factory;
private List<EntityManager> activeEntityManagerList;
private List<EntityManager> closedEntityManagerList;
static {
try {
if (factory == null) {
factory = createEntityManagerFactory();
}
} catch (ExceptionInInitializerError hata) {
throw hata;
}
}
public EntityManagerFabrikasi() {
activeEntityManagerList = new ArrayList <EntityManager>();
closedEntityManagerList = new ArrayList <EntityManager>();
}
@Override
public EntityManager createEntityManagerFactory () throws Exception {
try {
EntityManager entityManager = factory.createEntityManager();
this.activeEntityManagerList.add(entityManager);
return entityManager;
} catch (Exception hata ) {
throw hata;
}
}
@Override
public void close() throws Exception {
if(this.activeEntityManagerList!= null) {
for(EntityManager entityManager : this.activeEntityManagerList) {
if(entityManager == null )
continue;
entityManager.close();
}
}
}
@Override
public void close ( EntityManager entityManager ) {
if(entityManager == null)
return;
entityManager.clear();
entityManager.close();
this.activeEntityManagerList.remove(entityManager);
this.closedEntityManagerList.add(entityManager);
}
private static synchronized EntityManagerFactory createEntityManagerFactory() {
EntityManagerFactory entityManagerFactory = new HibernatePersistenceProvider()
.createContainerEntityManagerFactory(PersistenceUnitInfoIsleri.olusturPersistenceUnitInfo(),
getProperties());
return entityManagerFactory;
}
private static Map<String, String> getProperties() {
try {
Map<String, String> result = new HashMap<String, String>();
Properties properties = new Properties();
String databasaConnectionDetailsFile = "details.txt";
try (InputStream inputStream = EntityManagerFabrikasi.class.getClassLoader()
.getResourceAsStream(databasaConnectionDetailsFile)) {
if (inputStream != null)
properties.load(inputStream);
else
throw new Exception("Even if nothing happened, something definitely happened.");
}
Set<String> keys = properties.stringPropertyNames();
for (String key : keys)
result.put(key, properties.getProperty(key));
return result;
} catch (Exception hata) {
ExceptionAffairs exceptionAffairs = new ExceptionAffairs();
exceptionAffairs.report(hata);
}
return new HashMap<String, String>();
}
}
Here is the pom structure of the maven module with EntityManagerFactory:
<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>
<parent>
<groupId>experimental.tahasozgen</groupId>
<artifactId>institutiongeography</artifactId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<artifactId>institutiongeography-businesslayer</artifactId>
<name>institutiongeography-businesslayer</name>
<dependencies>
<dependency>
<groupId>experimental.tahasozgen</groupId>
<artifactId>institutiongeography-core</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>experimental.tahasozgen</groupId>
<artifactId>institutiongeography-contracts</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>experimental.tahasozgen</groupId>
<artifactId>institutiongeography-repository</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>experimental.tahasozgen</groupId>
<artifactId>institutiongeography-entities</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
<!-- umumi ba??ml?l?klar -->
<dependency>
<groupId>com.baidu.unbiz</groupId>
<artifactId>fluent-validator</artifactId>
<version>1.0.9</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>5.4.27.Final</version>
</dependency>
</dependencies>
</project>
All maven modules’ scope is “compile”. When I debug the program, It throws different exceptions in different debug sessions. The exceptions that thrown is as follows:
java.lang.NoClassDefFoundError: org/hibernate/service/ServiceRegistry
java.lang.NoClassDefFoundError: org.hibernate.jpa.HibernatePersistenceProvider
I presume that hibernate does not load at runtime. How can I resolve the issue? Thanks in advance.
uj5u.com熱心網友回復：
問題是 pom.xml 中兩個不同依賴項的沖突。依賴
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>5.4.27.Final</version>
</dependency>
都在機構地理核心的 pom 檔案和sampleZkProject的 pom 檔案中定義。當我從sampleZkProject的 pom 檔案中洗掉依賴項時，問題已經解決。您可以在 Eclipse 的依賴層次結構部分觀察依賴關系。
建議在 pom 安排后發出 maven clean 命令。
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