我正在将工作中的 java 8 项目转换为 java 11。我还不想使用模块(我知道有一些优点,但到目前为止我只想让项目在 java 11 下运行)。所以module-info.java
项目src文件夹中没有。
我使用Netbeans 11,(基于Maven的)项目可以成功构建(Linux下使用openjdk 11)。但是,当我运行它时,我得到
启动层 java.lang.module.FindException 初始化期间发生错误:无法为 /home/helloWorld/.m2/repository/org/apache/tika/tika-parsers/1.21/tika-parsers-1.21.jar 派生模块描述符引起:java.lang.module.InvalidModuleDescriptorException:提供程序类 org.apache.tika.parser.external.CompositeExternalParser 不在模块中
该项目pom.xml
如下:
<?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>MRE</groupId>
<artifactId>Example</artifactId>
<version>1.0.12</version>
<packaging>jar</packaging>
<parent>
<artifactId>MREWeb</artifactId>
<groupId>MRE</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<dependencies>
<dependency>
<groupId>MRE</groupId>
<artifactId>Base</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>org.apache.tika</groupId>
<artifactId>tika-parsers</artifactId>
<version>1.21</version>
<type>jar</type>
</dependency>
<dependency>
<groupId>org.apache.opennlp</groupId>
<artifactId>opennlp-tools</artifactId>
<version>1.9.0</version>
</dependency>
<dependency>
<groupId>net.sourceforge</groupId>
<artifactId>prajna</artifactId>
<version>1.0</version>
</dependency>
<dependency>
<groupId>com.github.stefanbirkner</groupId>
<artifactId>system-rules</artifactId>
<version>1.19.0</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.openjfx</groupId>
<artifactId>javafx-fxml</artifactId>
<version>11.0.2</version>
<type>jar</type>
</dependency>
<dependency>
<groupId>org.openjfx</groupId>
<artifactId>javafx-controls</artifactId>
<version>11.0.2</version>
</dependency>
<build>
<resources>
<resource>
<!--We specify the resource folder that should be included-->
<directory>src/main/resources</directory>
</resource>
</resources>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-enforcer-plugin</artifactId>
<version>3.0.0-M2</version>
<executions>
<execution>
<id>enforce-maven</id>
<goals>
<goal>enforce</goal>
</goals>
<configuration>
<rules>
<requireMavenVersion>
<version>3.3.9</version>
</requireMavenVersion>
</rules>
</configuration>
</execution>
</executions>
</plugin>
<!--See here for details https://www.baeldung.com/executable-jar-with-maven-->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
<configuration>
<archive>
<manifest>
<mainClass>
${mainClass}
</mainClass>
</manifest>
<!--Adds custom entry for version to manifest and changes Built By value-->
<manifestEntries>
<!--We use implementation version so that it can be retrieved within java from package methods-->
<Implementation-Version>${project.version}</Implementation-Version>
<Implementation-Title>${project.artifactId}</Implementation-Title>
<Built-By>HelloWorld</Built-By>
</manifestEntries>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.openjfx</groupId>
<artifactId>javafx-maven-plugin</artifactId>
<version>0.0.2</version>
<configuration>
<mainClass>${mainClass}</mainClass>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.0</version>
<configuration>
<release>11</release>
</configuration>
</plugin>
</plugins>
</build>
<name>MREWeb_Example</name>
</project>
Netbeans 在其控制台中输出的命令行是:
cd /home/helloWorld/java/projects/example;JAVA_HOME=/usr/lib/jvm/java-11-openjdk-amd64 /home/helloworld/netbeans/java/maven/bin/mvn "-Dexec.args=-classpath %classpath mre.example.MainApp" -Dexec.executable =/usr/lib/jvm/java-11-openjdk-amd64/bin/java -DskipTests=true clean javafx:run
如何将CompositeExternalParser
课程放入模块中(确实是哪个模块)?
编辑(按照注释中的建议将 javafx 添加到模块路径和添加模块之后)
如果我通过应用程序从命令行运行编译的(胖)jarjava --module-path /home/helloworld/Java/JavaFx/javafx-sdk-11.0.2/lib --add-modules javafx.controls,javafx.fxml -jar example-jar-with-dependencies.jar
运行良好。所以宁可在 Netbeans 中做些事情,对吧(但是什么 ;-))?
最小可重现示例(如评论中要求的那样)
- 通过 Maven Archetype (javafx-archetype-simple) 创建一个新的 Maven 项目,并按照OpenJfX 教程进行 Netbeans 中的非模块化 maven 项目
- 在 pom.xml 中添加 Tika 解析器依赖
<dependency> <groupId>org.apache.tika</groupId> <artifactId>tika-parsers</artifactId> <version>1.21</version> <type>jar</type> </dependency>
pom.xml 变成
<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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>minimum.reproducible</groupId>
<artifactId>MavenExample</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>11</maven.compiler.source>
<maven.compiler.target>11</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>org.openjfx</groupId>
<artifactId>javafx-controls</artifactId>
<version>11.0.2</version>
</dependency>
<dependency>
<groupId>org.apache.tika</groupId>
<artifactId>tika-parsers</artifactId>
<version>1.21</version>
<type>jar</type>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.0</version>
<configuration>
<release>11</release>
</configuration>
</plugin>
<plugin>
<groupId>org.openjfx</groupId>
<artifactId>javafx-maven-plugin</artifactId>
<version>0.0.2</version>
<configuration>
<mainClass>minimum.reproducible.mavenexample.App</mainClass>
</configuration>
</plugin>
<!--To include the main class attribute in the manifest file-->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>3.1.1</version>
<configuration>
<archive>
<manifest>
<mainClass>minimum.reproducible.mavenexample.App</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
</plugins>
</build>
</project>
- 从 Tika 示例中添加此方法
public String parseExample() throws IOException, SAXException, TikaException {
AutoDetectParser parser = new AutoDetectParser();
BodyContentHandler handler = new BodyContentHandler();
Metadata metadata = new Metadata();
try (InputStream stream = new FileInputStream(new File("/home/helloWorld/Texts/test.txt"))) {
parser.parse(stream, handler, metadata);
return handler.toString();
}
- 用一些代码增加 start 方法来运行之前创建的方法
public void start(Stage stage) {
var javaVersion = SystemInfo.javaVersion();
var javafxVersion = SystemInfo.javafxVersion();
var label = new Label("Hello, JavaFX " + javafxVersion + ", running on Java " + javaVersion + ".");
var scene = new Scene(new StackPane(label), 640, 480);
stage.setScene(scene);
stage.show();
System.err.println("Starting tika parsing");
try {
String result = parseExample();
System.err.println("The parsing yielded : ");
System.err.println(result);
} catch (IOException | SAXException | TikaException ex) {
Logger.getLogger(App.class.getName()).log(Level.SEVERE,
null,
ex);
}
}
现在清理并构建并运行该项目。应该发生所描述的错误。
请注意:如果这个最小的可重现示例程序是从命令行启动的,而没有Pom 中的 Tika 和 App.java 中的 Tika 相关内容,则程序运行良好。
java --module-path /home/helloworld/Java/JavaFx/javafx-sdk-11.0.2/lib --add-modules javafx.controls,javafx.fxml -jar MavenExample-1.0-SNAPSHOT.jar
但是,如果我尝试再次从命令行运行它,但使用上面最小可重现示例中描述的所有 Tika 内容,我会得到
缺少 JavaFX 应用程序类 minimum.reproducible.mavenexample.App
尽管 Netbeans 11 一直显示上面提到的 java.lang.module.InvalidModuleDescriptorException。
- 然而,如果将以下行添加到 pom.xml
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.6.0</version>
<configuration>
<mainClass>minimum.reproducible.mavenexample.App</mainClass>
</configuration>
</plugin>
现在项目可以通过mvn exec:java
. 所以我猜这个问题来自 javafx-maven-plugin,不是吗?
任何帮助表示赞赏;-)