Error: Could not find or load main class com.github.shia5347.terratoolbox.App
Error: Could not find or load main class com.github.shia5347.terratoolbox.App
问题
当我尝试通过将 slick2d 库指定为类路径来 运行 我的 jar 可执行文件时：
java -jar TerraToolBox-1.0-SNAPSHOT.jar -classpath org.newdawn.slick
;它给出了一个错误 Error: Could not find or load main class com.github.shia5347.terratoolbox.App。我还尝试了一个简单的 hello world 打印程序，而不是扩展 BasicGame 的 slick2d window 程序，但它起作用了。
我也曾尝试将 <addClasspath>true</addClasspath> 添加到 maven-jar-plugin 部分，但它仍然不起作用。
使用 jdeps
jdeps TerraToolBox-1.0-SNAPSHOT.jar
TerraToolBox-1.0-SNAPSHOT.jar -> not found
TerraToolBox-1.0-SNAPSHOT.jar -> /usr/lib/jvm/java-8-openjdk/jre/lib/rt.jar
com.github.shia5347.terratoolbox (TerraToolBox-1.0-SNAPSHOT.jar)
-> java.lang
-> java.util.logging
-> org.newdawn.slick not found
主要
package com.github.shia5347.terratoolbox;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.newdawn.slick.AppGameContainer;
import org.newdawn.slick.BasicGame;
import org.newdawn.slick.GameContainer;
import org.newdawn.slick.Graphics;
import org.newdawn.slick.SlickException;
public class App extends BasicGame
{
public App(String gamename)
{
super(gamename);
}
@Override
public void init(GameContainer gc) throws SlickException {}
@Override
public void update(GameContainer gc, int i) throws SlickException {}
@Override
public void render(GameContainer gc, Graphics g) throws SlickException
{
g.drawString("Howdy!", 10, 10);
}
public static void main(String[] args)
{
try
{
AppGameContainer appgc;
appgc = new AppGameContainer(new App("Simple Slick Game"));
appgc.setDisplayMode(640, 480, false);
appgc.start();
}
catch (SlickException ex)
{
Logger.getLogger(App.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
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>
<groupId>com.github.shia5347.terratoolbox</groupId>
<artifactId>TerraToolBox</artifactId>
<version>1.0-SNAPSHOT</version>
<name>TerraToolBox</name>
<!-- FIXME change it to the project's website -->
<url>http://www.example.com</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.7</maven.compiler.source>
<maven.compiler.target>1.7</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>javax.jnlp</groupId>
<artifactId>jnlp-api</artifactId>
<version>7.0</version>
<scope>system</scope>
<systemPath>/home/shahroz/netx-0.5/netx.jar</systemPath>
</dependency>
<!-- https://mvnrepository.com/artifact/org.slick2d/slick2d-core -->
<dependency>
<groupId>org.slick2d</groupId>
<artifactId>slick2d-core</artifactId>
<version>1.0.2</version>
</dependency>
</dependencies>
<build>
<pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
<plugins>
<!-- clean lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#clean_Lifecycle -->
<plugin>
<artifactId>maven-clean-plugin</artifactId>
<version>3.1.0</version>
</plugin>
<!-- default lifecycle, jar packaging: see https://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_jar_packaging -->
<plugin>
<artifactId>maven-resources-plugin</artifactId>
<version>3.0.2</version>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.0</version>
</plugin>
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.22.1</version>
</plugin>
<plugin>
<artifactId>maven-jar-plugin</artifactId>
<version>3.0.2</version>
</plugin>
<plugin>
<artifactId>maven-install-plugin</artifactId>
<version>2.5.2</version>
</plugin>
<plugin>
<artifactId>maven-deploy-plugin</artifactId>
<version>2.8.2</version>
</plugin>
<!-- site lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#site_Lifecycle -->
<plugin>
<artifactId>maven-site-plugin</artifactId>
<version>3.7.1</version>
</plugin>
<plugin>
<artifactId>maven-project-info-reports-plugin</artifactId>
<version>3.0.0</version>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<configuration>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<mainClass>com.github.shia5347.terratoolbox.App</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>
在 pom.xml
中将 addClasspath 设置为 true 后的 Manfiest 文件
Manifest-Version: 1.0
Archiver-Version: Plexus Archiver
Built-By: shahroz
Class-Path: slick2d-core-1.0.2.jar lwjgl-2.9.3.jar lwjgl-platform-2.9.
3-natives-windows.jar lwjgl-platform-2.9.3-natives-linux.jar lwjgl-pl
atform-2.9.3-natives-osx.jar jinput-2.0.5.jar jutils-1.0.0.jar jinput
-platform-2.0.5-natives-linux.jar jinput-platform-2.0.5-natives-windo
ws.jar jinput-platform-2.0.5-natives-osx.jar jorbis-0.0.17.jar
Created-By: Apache Maven 3.6.3
Build-Jdk: 1.8.0_275
Main-Class: com.github.shia5347.terratoolbox.App
首先，确保您的 java 环境配置正确。
我觉得可能是因为代码中加入了包名，在编译的.class文件中也生成了包名，但是在[=处找不到com.github.shia5347.terratoolbox 30=]次。
在Terminal中打开文件夹terratoolbox，然后运行javac -d. .\App.java，会生成一个.class文件。
然后还在terratoolbox文件夹下,运行java com.github.shia5347.terratoolbox.App.
试试这个，看看问题是否消失。
好的，我只是决定改用 libgdx。它使用 maven-assembly-plugin 与 maven 一起工作。我刚刚输入 mvn clean compile assembly:single ，然后将使用程序集插件。这是它的插件：
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<configuration>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<mainClass>com.github.shia5347.terratoolbox.App</mainClass>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
<executions>
<execution>
<id>make-assembly</id> <!-- this is used for inheritance merges -->
<phase>package</phase> <!-- bind to the packaging phase -->
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
问题
当我尝试通过将 slick2d 库指定为类路径来 运行 我的 jar 可执行文件时：
java -jar TerraToolBox-1.0-SNAPSHOT.jar -classpath org.newdawn.slick
;它给出了一个错误 Error: Could not find or load main class com.github.shia5347.terratoolbox.App。我还尝试了一个简单的 hello world 打印程序，而不是扩展 BasicGame 的 slick2d window 程序，但它起作用了。
我也曾尝试将 <addClasspath>true</addClasspath> 添加到 maven-jar-plugin 部分，但它仍然不起作用。
使用 jdeps
jdeps TerraToolBox-1.0-SNAPSHOT.jar
TerraToolBox-1.0-SNAPSHOT.jar -> not found
TerraToolBox-1.0-SNAPSHOT.jar -> /usr/lib/jvm/java-8-openjdk/jre/lib/rt.jar
com.github.shia5347.terratoolbox (TerraToolBox-1.0-SNAPSHOT.jar)
-> java.lang
-> java.util.logging
-> org.newdawn.slick not found
主要
package com.github.shia5347.terratoolbox;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.newdawn.slick.AppGameContainer;
import org.newdawn.slick.BasicGame;
import org.newdawn.slick.GameContainer;
import org.newdawn.slick.Graphics;
import org.newdawn.slick.SlickException;
public class App extends BasicGame
{
public App(String gamename)
{
super(gamename);
}
@Override
public void init(GameContainer gc) throws SlickException {}
@Override
public void update(GameContainer gc, int i) throws SlickException {}
@Override
public void render(GameContainer gc, Graphics g) throws SlickException
{
g.drawString("Howdy!", 10, 10);
}
public static void main(String[] args)
{
try
{
AppGameContainer appgc;
appgc = new AppGameContainer(new App("Simple Slick Game"));
appgc.setDisplayMode(640, 480, false);
appgc.start();
}
catch (SlickException ex)
{
Logger.getLogger(App.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
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>
<groupId>com.github.shia5347.terratoolbox</groupId>
<artifactId>TerraToolBox</artifactId>
<version>1.0-SNAPSHOT</version>
<name>TerraToolBox</name>
<!-- FIXME change it to the project's website -->
<url>http://www.example.com</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.7</maven.compiler.source>
<maven.compiler.target>1.7</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>javax.jnlp</groupId>
<artifactId>jnlp-api</artifactId>
<version>7.0</version>
<scope>system</scope>
<systemPath>/home/shahroz/netx-0.5/netx.jar</systemPath>
</dependency>
<!-- https://mvnrepository.com/artifact/org.slick2d/slick2d-core -->
<dependency>
<groupId>org.slick2d</groupId>
<artifactId>slick2d-core</artifactId>
<version>1.0.2</version>
</dependency>
</dependencies>
<build>
<pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
<plugins>
<!-- clean lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#clean_Lifecycle -->
<plugin>
<artifactId>maven-clean-plugin</artifactId>
<version>3.1.0</version>
</plugin>
<!-- default lifecycle, jar packaging: see https://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_jar_packaging -->
<plugin>
<artifactId>maven-resources-plugin</artifactId>
<version>3.0.2</version>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.0</version>
</plugin>
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.22.1</version>
</plugin>
<plugin>
<artifactId>maven-jar-plugin</artifactId>
<version>3.0.2</version>
</plugin>
<plugin>
<artifactId>maven-install-plugin</artifactId>
<version>2.5.2</version>
</plugin>
<plugin>
<artifactId>maven-deploy-plugin</artifactId>
<version>2.8.2</version>
</plugin>
<!-- site lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#site_Lifecycle -->
<plugin>
<artifactId>maven-site-plugin</artifactId>
<version>3.7.1</version>
</plugin>
<plugin>
<artifactId>maven-project-info-reports-plugin</artifactId>
<version>3.0.0</version>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<configuration>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<mainClass>com.github.shia5347.terratoolbox.App</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>
在 pom.xml
中将 addClasspath 设置为 true 后的 Manfiest 文件Manifest-Version: 1.0
Archiver-Version: Plexus Archiver
Built-By: shahroz
Class-Path: slick2d-core-1.0.2.jar lwjgl-2.9.3.jar lwjgl-platform-2.9.
3-natives-windows.jar lwjgl-platform-2.9.3-natives-linux.jar lwjgl-pl
atform-2.9.3-natives-osx.jar jinput-2.0.5.jar jutils-1.0.0.jar jinput
-platform-2.0.5-natives-linux.jar jinput-platform-2.0.5-natives-windo
ws.jar jinput-platform-2.0.5-natives-osx.jar jorbis-0.0.17.jar
Created-By: Apache Maven 3.6.3
Build-Jdk: 1.8.0_275
Main-Class: com.github.shia5347.terratoolbox.App
首先，确保您的 java 环境配置正确。
我觉得可能是因为代码中加入了包名，在编译的.class文件中也生成了包名，但是在[=处找不到com.github.shia5347.terratoolbox 30=]次。
在Terminal中打开文件夹terratoolbox，然后运行javac -d. .\App.java，会生成一个.class文件。
然后还在terratoolbox文件夹下,运行java com.github.shia5347.terratoolbox.App.
试试这个，看看问题是否消失。
好的，我只是决定改用 libgdx。它使用 maven-assembly-plugin 与 maven 一起工作。我刚刚输入 mvn clean compile assembly:single ，然后将使用程序集插件。这是它的插件：
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<configuration>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<mainClass>com.github.shia5347.terratoolbox.App</mainClass>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
<executions>
<execution>
<id>make-assembly</id> <!-- this is used for inheritance merges -->
<phase>package</phase> <!-- bind to the packaging phase -->
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>