我想運行官方耶拿文件的第一個例子。一個簡單的耶拿例子不工作
這裏是我得到的錯誤,當我運行命令 「Java的罐子目標/我-APP-1.0-SNAPSHOT-JAR-與-dependencies.jar」:
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
Exception in thread "main" java.lang.ExceptionInInitializerError
at com.mycompany.app.RdfWriter.main(RdfWriter.java:13)
Caused by: java.lang.NullPointerException
at org.apache.jena.tdb.sys.EnvTDB.processGlobalSystemProperties(EnvTDB.java:33)
at org.apache.jena.tdb.TDB.init(TDB.java:248)
at org.apache.jena.tdb.sys.InitTDB.start(InitTDB.java:29)
at org.apache.jena.system.JenaSystem.lambda$init$2(JenaSystem.java:119)
at java.util.ArrayList.forEach(ArrayList.java:1249)
at org.apache.jena.system.JenaSystem.forEach(JenaSystem.java:194)
at org.apache.jena.system.JenaSystem.forEach(JenaSystem.java:171)
at org.apache.jena.system.JenaSystem.init(JenaSystem.java:117)
at org.apache.jena.rdf.model.ModelFactory.<clinit>(ModelFactory.java:49)
... 1 more
這裏是我的POM文件:
<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>com.mycompany.app</groupId>
<artifactId>my-app</artifactId>
<packaging>jar</packaging>
<version>1.0-SNAPSHOT</version>
<name>my-app</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.jena</groupId>
<artifactId>apache-jena-libs</artifactId>
<version>3.1.1</version>
<type>pom</type>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.7</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<configuration>
<archive>
<manifest>
<mainClass>com.mycompany.app.RdfWriter</mainClass>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
</plugin>
</plugins>
</build>
</project>
這裏是唯一的文件,我到目前爲止有:
package com.mycompany.app;
import org.apache.jena.rdf.model.*;
import org.apache.jena.vocabulary.*;
public class RdfWriter {
static String personURI = "http://somewhere/JohnSmith";
static String fullName = "John Smith";
public static void main(String[] args) {
// create an empty model
Model model = ModelFactory.createDefaultModel();
// create the resource
Resource johnSmith = model.createResource(personURI);
// add the property
johnSmith.addProperty(VCARD.FN, fullName);
System.out.println("this is rdf writer");
}
}
我只是想上手,所以如果有WA如果問題比較簡單,請修復該問題,甚至不使用maven,請告訴我。
我添加了一個新的依賴的依賴在我的POM文件塔希爾後面提到的是,在這樣回答:
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-simple</artifactId>
<version>1.6.2</version>
</dependency>
,現在我收到此錯誤:
Exception in thread "main" java.lang.ExceptionInInitializerError
at com.mycompany.app.RdfWriter.main(RdfWriter.java:14)
Caused by: java.lang.NullPointerException
at org.apache.jena.tdb.sys.EnvTDB.processGlobalSystemProperties(EnvTDB.java:33)
at org.apache.jena.tdb.TDB.init(TDB.java:248)
at org.apache.jena.tdb.sys.InitTDB.start(InitTDB.java:29)
at org.apache.jena.system.JenaSystem.lambda$init$2(JenaSystem.java:119)
at java.util.ArrayList.forEach(ArrayList.java:1249)
at org.apache.jena.system.JenaSystem.forEach(JenaSystem.java:194)
at org.apache.jena.system.JenaSystem.forEach(JenaSystem.java:171)
at org.apache.jena.system.JenaSystem.init(JenaSystem.java:117)
at org.apache.jena.rdf.model.ModelFactory.<clinit>(ModelFactory.java:49)
... 1 more
感謝
提出和回答耶拿用戶列表:https://lists.apache.org/thread.html/[email protected]%3Cusers.jena.apache.org%3E – AndyS
@AndyS,我添加了一個鏈接,日食選項,你提到的答案是這樣的:我不知道如何將它們與彙編插件結合起來。希望有人知道這裏。 –