Question

我一直在Eclipse中开展一个项目，除了一些Ant问题之外，一切都很顺利。

我的代码完美编译并完全按照我的意愿执行，但是，当它在jar中时，我收到错误：

Exception in thread "main" java.lang.NoSuchMethodError: main

Main肯定存在于文件中，所以我的猜测是它与文件的构造方式有关。我一直在使用SuperCSV阅读我的一些excel表，并在网站上的示例中构建了我的主要课程：http://supercsv.sourceforge.net/codeExamples_general.html。这是我的改编：

ExcelFile.java

package jab.jm.main;

import jab.jm.readers.FileManager;

import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.net.URL;

import junit.framework.Test;

import org.supercsv.cellprocessor.constraint.StrMinMax;
import org.supercsv.cellprocessor.ift.CellProcessor;
import org.supercsv.io.CsvBeanReader;
import org.supercsv.io.ICsvBeanReader;
import org.supercsv.prefs.CsvPreference;

class ReadingObjects {

    static final CellProcessor[] userProcessors = { null,
            new StrMinMax(0, 100), null, new StrMinMax(0, 100), null,
            new StrMinMax(0, 100), null, null, null, null, null, null, null,
            null, null, null, null, null, null, null, null, null, null, null,
            null, null, null, null, null, new StrMinMax(0, 100), null,
            new StrMinMax(0, 100), null, null, null, null, null, null, null,
            null, null, null, null, null, null, null, null, null, null, null,
            null, null, null, null, null, null, null, null, null };


    public static void main(String[] args) throws Exception {
        ICsvBeanReader inFile = new CsvBeanReader(
                new FileReader(
                        "C:\\Users\\Justian\\workspaces\\LNConnectionCompiler\\src\\jab\\jm\\main\\Fred_Jewell.csv"),
                CsvPreference.EXCEL_PREFERENCE);
        try {
            final String[] header = { "title", "firstName", "middleName",
                    "lastName", "suffix", "email", "email2", "email3",
                    "businessStreet", "businessStreet2", "businessStreet3",
                    "businessCity", "businessState", "businessPostalCode",
                    "businessCountry", "homeStreet", "homeStreet2",
                    "homeStreet3", "homeCity", "homeState", "homePostalCode",
                    "homeCountry", "otherStreet", "otherStreet2",
                    "otherStreet3", "otherCity", "otherState",
                    "otherPostalCode", "otherCountry", "company", "department",
                    "jobTitle", "assistantPhone", "businessFax",
                    "businessPhone", "businessPhone2", "callback", "carPhone",
                    "companyMainPhone", "homeFax", "homePhone", "homePhone2",
                    "isdn", "mobilePhone", "otherFax", "otherPhone", "pager",
                    "primaryPhone", "radioPhone", "TTYTTDPhone", "telex",
                    "assistantName", "birthday", "managerName", "notes",
                    "otherPOBox", "spouse", "webPage", "personalWebPage" };
            ExcelFile file;
            while ((file = inFile.read(ExcelFile.class, header, userProcessors)) != null) {
                if (file.getCompany().indexOf("Jabian") >= 0)
                    System.out.println(file.getFirstName() + " " + file.getLastName());
            }
        } finally {
            inFile.close();
        }

        URL location = ExcelFile.class.getProtectionDomain().getCodeSource().getLocation();
        System.out.println(location.getFile());

    }
}

public class ExcelFile {
    private String title, firstName, middleName, lastName, suffix, email,
            email2, email3, businessStreet, businessStreet2, businessStreet3,
            businessCity, businessState, businessPostalCode, businessCountry,
            homeStreet, homeStreet2, homeStreet3, homeCity, homeState,
            homePostalCode, homeCountry, otherStreet, otherStreet2,
            otherStreet3, otherCity, otherState, otherPostalCode, otherCountry,
            company, department, jobTitle, assistantPhone, businessFax,
            businessPhone, businessPhone2, callback, carPhone,
            companyMainPhone, homeFax, homePhone, homePhone2, isdn,
            mobilePhone, otherFax, otherPhone, pager, primaryPhone, radioPhone,
            TTYTTDPhone, telex, assistantName, birthday, managerName, notes,
            otherPOBox, spouse, webPage, personalWebPage;

    public String getTitle() {
        return title;
    }

    public String getFirstName() {
        return firstName;
    }

    public String getMiddleName() {
        return middleName;
    }

    public String getLastName() {
        return lastName;
    }

    public String getSuffix() {
        return suffix;
    }

    public String getEmail() {
        return email;
    }

    public String getEmail2() {
        return email2;
    }

    public String getEmail3() {
        return email3;
    }

    public String getBusinessStreet() {
        return businessStreet;
    }

    public String getBusinessStreet2() {
        return businessStreet2;
    }

    public String getBusinessStreet3() {
        return businessStreet3;
    }

    public String getBusinessCity() {
        return businessCity;
    }

    public String getBusinessState() {
        return businessState;
    }

    public String getBusinessPostalCode() {
        return businessPostalCode;
    }

    public String getBusinessCountry() {
        return businessCountry;
    }

    public String getHomeStreet() {
        return homeStreet;
    }

    public String getHomeStreet2() {
        return homeStreet2;
    }

    public String getHomeStreet3() {
        return homeStreet3;
    }

    public String getHomeCity() {
        return homeCity;
    }

    public String getHomeState() {
        return homeState;
    }

    public String getHomePostalCode() {
        return homePostalCode;
    }

    public String getHomeCountry() {
        return homeCountry;
    }

    public String getOtherStreet() {
        return otherStreet;
    }

    public String getOtherStreet2() {
        return otherStreet2;
    }

    public String getOtherStreet3() {
        return otherStreet3;
    }

    public String getOtherCity() {
        return otherCity;
    }

    public String getOtherState() {
        return otherState;
    }

    public String getOtherPostalCode() {
        return otherPostalCode;
    }

    public String getOtherCountry() {
        return otherCountry;
    }

    public String getCompany() {
        return company;
    }

    public String getDepartment() {
        return department;
    }

    public String getJobTitle() {
        return jobTitle;
    }

    public String getAssistantPhone() {
        return assistantPhone;
    }

    public String getBusinessFax() {
        return businessFax;
    }

    public String getBusinessPhone() {
        return businessPhone;
    }

    public String getBusinessPhone2() {
        return businessPhone2;
    }

    public String getCallBack() {
        return callback;
    }

    public String getCarPhone() {
        return carPhone;
    }

    public String getCompanyMainPhone() {
        return companyMainPhone;
    }

    public String getHomeFax() {
        return homeFax;
    }

    public String getHomePhone() {
        return homePhone;
    }

    public String getHomePhone2() {
        return homePhone2;
    }

    public String getISDN() {
        return isdn;
    }

    public String getMobilePhone() {
        return mobilePhone;
    }

    public String getOtherFax() {
        return otherFax;
    }

    public String getOtherPhone() {
        return otherPhone;
    }

    public String getPager() {
        return pager;
    }

    public String getPrimaryPhone() {
        return primaryPhone;
    }

    public String getRadioPhone() {
        return radioPhone;
    }

    public String getTTYTTDPhone() {
        return TTYTTDPhone;
    }

    public String getTelex() {
        return telex;
    }

    public String getAssistantName() {
        return assistantName;
    }

    public String getBirthday() {
        return birthday;
    }

    public String getManagerName() {
        return managerName;
    }

    public String getNotes() {
        return notes;
    }

    public String getOtherPOBox() {
        return otherPOBox;
    }

    public String getSpouse() {
        return spouse;
    }

    public String getWebPage() {
        return webPage;
    }

    public String getPersonalWebPage() {
        return personalWebPage;
    }

    public void setTitle(final String title) {
        this.title = title;
    }

    public void setFirstName(final String firstName) {
        this.firstName = firstName;
    }

    public void setMiddleName(final String middleName) {
        this.middleName = middleName;
    }

    public void setLastName(final String lastName) {
        this.lastName = lastName;
    }

    public void setSuffix(final String suffix) {
        this.suffix = suffix;
    }

    public void setEmail(final String email) {
        this.email = email;
    }

    public void setEmail2(final String email2) {
        this.email2 = email2;
    }

    public void setEmail3(final String email3) {
        this.email3 = email3;
    }

    public void setBusinessStreet(final String businessStreet) {
        this.businessStreet = businessStreet;
    }

    public void setBusinessStreet2(final String businessStreet2) {
        this.businessStreet2 = businessStreet2;
    }

    public void setBusinessStreet3(final String businessStreet3) {
        this.businessStreet3 = businessStreet3;
    }

    public void setBusinessCity(final String businessCity) {
        this.businessCity = businessCity;
    }

    public void setBusinessState(final String businessState) {
        this.businessState = businessState;
    }

    public void setBusinessPostalCode(final String businessPostalCode) {
        this.businessPostalCode = businessPostalCode;
    }

    public void setBusinessCountry(final String businessCountry) {
        this.businessCountry = businessCountry;
    }

    public void setHomeStreet(final String homeStreet) {
        this.homeStreet = homeStreet;
    }

    public void setHomeStreet2(final String homeStreet2) {
        this.homeStreet2 = homeStreet2;
    }

    public void setHomeStreet3(final String homeStreet3) {
        this.homeStreet3 = homeStreet3;
    }

    public void setHomeCity(final String homeCity) {
        this.homeCity = homeCity;
    }

    public void setHomeState(final String homeState) {
        this.homeState = homeState;
    }

    public void setHomePostalCode(final String homePostalCode) {
        this.homePostalCode = homePostalCode;
    }

    public void setHomeCountry(final String homeCountry) {
        this.homeCountry = homeCountry;
    }

    public void setOtherStreet(final String otherStreet) {
        this.otherStreet = otherStreet;
    }

    public void setOtherStreet2(final String otherStreet2) {
        this.otherStreet2 = otherStreet2;
    }

    public void setOtherStreet3(final String otherStreet3) {
        this.otherStreet3 = otherStreet3;
    }

    public void setOtherCity(final String otherCity) {
        this.otherCity = otherCity;
    }

    public void setOtherState(final String otherState) {
        this.otherState = otherState;
    }

    public void setOtherPostalCode(final String otherPostalCode) {
        this.otherPostalCode = otherPostalCode;
    }

    public void setOtherCountry(final String otherCountry) {
        this.otherCountry = otherCountry;
    }

    public void setCompany(final String company) {
        this.company = company;
    }

    public void setDepartment(final String department) {
        this.department = department;
    }

    public void setJobTitle(final String jobTitle) {
        this.jobTitle = jobTitle;
    }

    public void setAssistantPhone(final String assistantPhone) {
        this.assistantPhone = assistantPhone;
    }

    public void setBusinessFax(final String businessFax) {
        this.businessFax = businessFax;
    }

    public void setBusinessPhone(final String businessPhone) {
        this.businessPhone = businessPhone;
    }

    public void setBusinessPhone2(final String businessPhone2) {
        this.businessPhone2 = businessPhone2;
    }

    public void setCallback(final String callback) {
        this.callback = callback;
    }

    public void setCarPhone(final String carPhone) {
        this.carPhone = carPhone;
    }

    public void setCompanyMainPhone(final String companyMainPhone) {
        this.companyMainPhone = companyMainPhone;
    }

    public void setHomeFax(final String homeFax) {
        this.homeFax = homeFax;
    }

    public void setHomePhone(final String homePhone) {
        this.homePhone = homePhone;
    }

    public void setHomePhone2(final String homePhone2) {
        this.homePhone2 = homePhone2;
    }

    public void setIsdn(final String isdn) {
        this.isdn = isdn;
    }

    public void setMobilePhone(final String mobilePhone) {
        this.mobilePhone = mobilePhone;
    }

    public void setOtherFax(final String otherFax) {
        this.otherFax = otherFax;
    }

    public void setOtherPhone(final String otherPhone) {
        this.otherPhone = otherPhone;
    }

    public void setPager(final String pager) {
        this.pager = pager;
    }

    public void setPrimaryPhone(final String primaryPhone) {
        this.primaryPhone = primaryPhone;
    }

    public void setRadioPhone(final String radioPhone) {
        this.radioPhone = radioPhone;
    }

    public void setTTYTTDPhone(final String TTYTTDPhone) {
        this.TTYTTDPhone = TTYTTDPhone;
    }

    public void setTelex(final String telex) {
        this.telex = telex;
    }

    public void setAssistantName(final String assistantName) {
        this.assistantName = assistantName;
    }

    public void setBirthday(final String birthday) {
        this.birthday = birthday;
    }

    public void setManagerName(final String managerName) {
        this.managerName = managerName;
    }

    public void setNotes(final String notes) {
        this.notes = notes;
    }

    public void setOtherPOBox(final String otherPOBox) {
        this.otherPOBox = otherPOBox;
    }

    public void setSpouse(final String spouse) {
        this.spouse = spouse;
    }

    public void setWebPage(final String webPage) {
        this.webPage = webPage;
    }

    public void setPersonalWebPage(final String personalWebPage) {
        this.personalWebPage = personalWebPage;
    }

}

在我看来，这是一个糟糕的结构，但它完全有可能，这就是为什么我不会遇到任何问题编译。当然，因为它是一个非常不寻常的结构，Ant可能无法尝试访问它。

请注意，ExcelFile.Java包含非公共类ReadingObjects，其中包含main方法。我的理论是，因为ExcelFile.java不一定是包含main方法的类，所以我遇到了问题

让我知道你们的想法。我愿意尝试一下。

非常感谢提前！

-Justian

编辑：这是我的构建文件：

<?xml version="1.0" ?>

<project name="ServerJar" default="dist" basedir=".">
    <description>
        Builds client files into .jar
    </description>
    <!-- [build variables] -->
    <property name="src" location="src" />
    <property name="build" location="build" />
    <property name="dist" location="dist" />
    <property name="lib" location="lib" />
    <!-- [path to packages] -->
    <path id="master-classpath">
        <fileset dir="${lib}">
            <include name="*.jar"/>
        </fileset>
    </path>


    <target name="init">
        <!-- makes time stamp to be used in jar name -->
        <tstamp />
        <!-- creates build directory structure -->
        <mkdir dir="${build}" />
    </target>

    <target name="compile" depends="init" description="Compiles the source">
        <!-- compiles the java code from ${src} into ${build} -->
        <!-- <javac srcdir="${src}" destdir="${build}" /> -->
        <javac destdir= "${build}">
            <src path="${src}"/>
            <classpath refid="master-classpath"/>
        </javac>
    </target>

    <target name="dist" depends="compile" description="Generates distributable">
    <!-- creates the distribution directory -->
        <mkdir dir="${dist}/lib" />

        <!-- puts everything in ${build} into the jar file -->
        <jar jarfile="${dist}/lib/CC-${DSTAMP}.jar" basedir="${build}">
            <manifest>
                <attribute name="Main-Class" value="jab.jm.main.ExcelFile" />
            </manifest>
        </jar>

        <!-- makes a jar file for quick test execution -->
        <jar jarfile="${dist}/lib/CC.jar" basedir="${build}">
            <manifest>
                <attribute name="Main-Class" value="jab.jm.main.ExcelFile" />
            </manifest>
        </jar>
    </target>

    <target name="clean" description="Cleans up the extra build files">
        <!-- deletes the ${build} and ${dist} directories -->
        <delete dir="${build}" />
        <delete dir="${dist}" />
    </target>
</project>

编辑：没有运气。也许我们可以考虑将我的一个文件重组为两个？

我有点紧张，因为我不知道SuperCSV需要什么样的格式。

Answer 1

确保您的清单文件中包含以下条目：

Main-Class: com.yourcompany.ReadingObjects

之后，你需要运行这样的程序：

$ java -jar nameofyourjar.jar

其他可能性包括像这样运行你的程序（不需要Manifest更改）：

$ java -cp nameofyourjar.jar com.yourcompany.ReadingObjects

问候。

Answer 2

使用-cp参数时，-classpath（和-jar）参数被忽略。您需要在JAR的Class-Path文件的MANIFEST.MF属性中指定它。

我的蚂蚁有点生疏，但它就像那些线：

<attribute name="Class-Path" value="${dist.classpath}"/>

更新根据您的意见，您想知道如何直接使用Eclipse执行此操作，而不是使用Ant。首先，您需要使用 Ctrl + F11 运行建议的main()方法，然后右键单击该项目，选择 Export＆gt; Runnable JAR文件（注意“Runnable”部分，这很重要！）。然后，在向导中，您必须从列表中选择相同的启动配置（如果需要，选择库处理），然后单击完成。这样，Eclipse将在生成MANIFEST文件时自动考虑构建路径详细信息。

Answer 3

无论您正在构建，最终都会在JAR中使用META-INF/MANIFEST.MF。该文件 - 提取它以查看它包含的内容 - 需要在其中有一个Main-Class条目，以使JAR可执行（因此java可以知道从哪个类开始执行）。标记为主类的类可以具有任何可见性 - 我倾向于将它们公开 - 并且方法必须同时为public和static。

现在换另一个，重要的问题。您需要将所有依赖项打包到可执行JAR文件中，因为您无法将位于JAR之外的内容放在类路径上。（你可以使用另一个类加载器和动态加载技巧，但这是一个完全不同的毛羽水平。）当你开始进入这种事情时，Maven开始看起来不那么压倒......

Answer 4

您的main方法实际上在ReadingObjects类上，该类也需要public。清单行应该是：

Main-Class: package jab.jm.main.ReadingObjects

以下是详细说明和正在运行的ANT文件，可以执行您要执行的操作。 Build an Executable .jar file

在再次研究您的代码之后，我认为源文件应该被称为ReadingObjects.java，ReadingObjects类应该是公共的，一切都会按照您的意愿运行。

Answer 5

您也可以在eclipse中创建一个可运行的jar而不是Ant构建，它会询问您哪个文件包含main，它通常会找到正确的。如果我没记错的话，你应该选择将内容打包成.jar文件。

Jar无法找到主要方法 - 连接到主类，但无法访问方法

5 个答案: