jar文件中缺少主要属性，MANIFEST.MF文件位于META-INF文件夹中

时间：2018-07-05 09:42:02

标签： java executable-jar

我无法从命令提示符下运行maven创建的jar文件。我正在使用以下命令执行我的jar文件 ElasticSearchUtility-1.0.0-SNAPSHOT.jar。

java -jar ElasticSearchUtility-1.0.0-SNAPSHOT.jar

我收到以下消息：

no main manifest attribute, in ElasticSearchUtility-1.0.0-SNAPSHOT.jar

我有以下Java文件

Document.java  (POJO Class)
DocumentIndex   (Main Class)

我已经编译了这个Maven项目并生成了.jar文件。在执行此.jar文件时，其未执行。

请找到我的项目结构

enter image description here

更新了pom.xml 

<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>ElasticSearchUtility</groupId>
<artifactId>ElasticSearchUtility</artifactId>
<version>1.0.0-SNAPSHOT</version>

<dependencies>
    <dependency>
        <groupId>org.elasticsearch</groupId>
        <artifactId>elasticsearch</artifactId>
        <version>6.1.2</version>
    </dependency>
    <dependency>
        <groupId>org.elasticsearch.client</groupId>
        <artifactId>elasticsearch-rest-high-level-client</artifactId>
        <version>6.1.2</version>
    </dependency>
    <dependency>
        <groupId>org.elasticsearch.client</groupId>
        <artifactId>rest</artifactId>
        <version>5.1.2</version>
    </dependency>

</dependencies>

<build>

        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-eclipse-plugin</artifactId>
                <version>2.9</version>
                <configuration>
                    <downloadSources>true</downloadSources>
                    <downloadJavadocs>false</downloadJavadocs>
                </configuration>
            </plugin>

            <!-- Set a compiler level -->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>2.3.2</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>

            <!-- Make this jar executable -->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-jar-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>**/log4j.properties</exclude>
                    </excludes>
                    <archive>
                        <manifest>
                            <addClasspath>true</addClasspath>
                            <mainClass>ProjectJar.project.App</mainClass>
                            <classpathPrefix>dependency-jars/</classpathPrefix>
                        </manifest>
                    </archive>
                </configuration>
            </plugin>
            <!-- Copy project dependency -->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-dependency-plugin</artifactId>
                <version>2.5.1</version>
                <executions>
                    <execution>
                        <id>copy-dependencies</id>
                        <phase>package</phase>
                        <goals>
                            <goal>copy-dependencies</goal>
                        </goals>
                        <configuration>
                            <!-- exclude junit, we need runtime dependency only -->
                            <includeScope>runtime</includeScope>
                            <outputDirectory>${project.build.directory}/dependency-
                                jars/</outputDirectory>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
            </plugins>
    </build>
    </project>

请在下面找到我的主要班级。

公共类DocumentIndex {

private final static String INDEX = "documents_local";  //Documents Table with file Path - Source
private final static String ATTACHMENT = "document_attachment_dev"; // Documents with Attachment...  -- Destination //document_attachment//
private final static String TYPE = "doc";
private static final Logger logger = Logger.getLogger(Thread.currentThread().getStackTrace()[0].getClassName());

public static void main(String args[]) throws IOException {


    RestHighLevelClient restHighLevelClient = null;
    Document doc=new Document();

    logger.info("Started Indexing the Document.....");

    try {
        restHighLevelClient = new RestHighLevelClient(RestClient.builder(new HttpHost("localhost", 9200, "http"),
                new HttpHost("localhost", 9201, "http")));
    } catch (Exception e) {
        System.out.println(e.getMessage());
    }


    //Fetching Id, FilePath & FileName from Document Index. 
    SearchRequest searchRequest = new SearchRequest(INDEX); 
    searchRequest.types(TYPE);
    SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
    QueryBuilder qb = QueryBuilders.matchAllQuery();
    searchSourceBuilder.query(qb);
    searchSourceBuilder.size(3000);
    searchRequest.source(searchSourceBuilder);
    SearchResponse searchResponse = null;
    try {
         searchResponse = restHighLevelClient.search(searchRequest);
    } catch (IOException e) {
        e.getLocalizedMessage();
    }

    SearchHit[] searchHits = searchResponse.getHits().getHits();
    long totalHits=searchResponse.getHits().totalHits;
    logger.info("Total Hits --->"+totalHits);

    int line=1;

    Map<String, Object> jsonMap ;
    for (SearchHit hit : searchHits) {

        String encodedfile = null;
        File file=null;

        Map<String, Object> sourceAsMap = hit.getSourceAsMap();
        doc.setId((int) sourceAsMap.get("id"));
        doc.setApp_language(sourceAsMap.get("app_language").toString());

        String filepath=doc.getPath().concat(doc.getFilename());

        logger.info("Line Number--> "+line+++"ID---> "+doc.getId()+"File Path --->"+filepath);

        try(PrintWriter out = new PrintWriter(new FileOutputStream(new File("d:\\AllFilePath.txt"), true))  ){
            out.println("Line Number--> "+line+"ID---> "+doc.getId()+"File Path --->"+filepath);
        }

        file = new File(filepath);
        if(file.exists() && !file.isDirectory()) {
            try {
                  try(PrintWriter out = new PrintWriter(new FileOutputStream(new File("d:\\AvailableFile.txt"), true))  ){
                        out.println("Line Number--> "+line+++"ID---> "+doc.getId()+"File Path --->"+filepath);
                    }
                FileInputStream fileInputStreamReader = new FileInputStream(file);
                byte[] bytes = new byte[(int) file.length()];
                fileInputStreamReader.read(bytes);
                encodedfile = new String(Base64.getEncoder().encodeToString(bytes));
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
        }

        jsonMap = new HashMap<>();
        jsonMap.put("id", doc.getId());
        jsonMap.put("app_language", doc.getApp_language());
        jsonMap.put("fileContent", encodedfile);

        String id=Long.toString(doc.getId());

        IndexRequest request = new IndexRequest(ATTACHMENT, "doc", id )
                .source(jsonMap)
                .setPipeline(ATTACHMENT);


        try {
            IndexResponse response = restHighLevelClient.index(request);
        } catch(ElasticsearchException e) {
            if (e.status() == RestStatus.CONFLICT) {
            }
            e.printStackTrace();
        }

        line++;

    }

    logger.info("Indexing done.....");


}

}

在编译我的pom.xml文件时遇到错误

Failed to execute goal org.apache.maven.plugins:maven-dependency-plugin:2.5.1:copy-dependencies (copy-dependencies) on project ElasticSearchUtility: Error copying artifact from C:\Users\10641516\.m2\repository\org\apache\lucene\lucene-sandbox\7.1.0\lucene-sandbox-7.1.0.jar to D:\Karthikeyan\ElasticSearch\ElasticSearch_Tesing\target\dependency-
    [ERROR] jars\lucene-sandbox-7.1.0.jar: The filename, directory name, or volume label syntax is incorrect

1 个答案:

答案 0 :(得分：1)

您已经添加了编译器插件，但是没有指定哪个类是您的主类。这就是为什么您得到确切的错误public void awb_enquiry() throws Exception { String handles= driver.getWindowHandle(); System.out.println(handles); driver.switchTo().window(handles); driver.findElement(By.xpath("//*[text()='Select']")).click(); } 的原因，因为编译器找不到它。由于主类充当您应用程序的入口点，因此无法启动。

要解决此问题，请将您的DocumentIndex主类添加到pom.xml内部的配置中。在您的maven编译器插件的配置标签内添加：

no main manifest attribute

另请参阅this answer。

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