Jar无法找到主方法 - 连接到主类，但无法访问方法 [英] Jar Can't Find Main Method - Connected to main class, but can't access method

问题描述

我一直在一个项目在Eclipse中工作，一切顺利，除了一些Ant问题。

I've been working on a project in Eclipse and everything's been going smooth except for some Ant issues along the way.

我的代码完全编译，并且完全符合我想要的操作，但是当它在一个jar中时，我得到错误：

My code compiles perfectly and does exactly what I want it to do, but, when it's in a jar, I get the error:

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读取一些excel表，我已经构建了我的主类围绕示例从网站： http://supercsv.sourceforge.net/codeExamples_general.html 。这是我的适应：

Main definitely exists in the file, so my guess is that it has to do with the way the file is constructed. I've been using SuperCSV to read some excel sheets I have and have constructed my main class around the example from the website: http://supercsv.sourceforge.net/codeExamples_general.html. Here's my adaptation:

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;
    }

}

一个糟糕的建设，但它是完全可能的，这就是为什么我不会遇到任何问题编译。当然，因为这是一个不寻常的建设，Ant可能无法尝试访问它。

This, in my mind, is a poor construction, but it is entirely possible and that's why I don't run into any issues compiling. Of course, because it's such an unusual construction, Ant may be having trouble trying to access it.

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不一定是包含主要方法的类，我遇到了问题

让我知道什么你们想。

Let me know what you guys think. I'm willing to give things a shot.

-Justian

Many thanks in advance!

编辑：这是我的构建文件：

EDIT: Here is my build file:

编辑：没有任何东西。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，因为我不知道什么样的格式SuperCSV

No Luck on anything. Maybe we can look into reorganizing my one file into two?

推荐答案

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

解决方案

我的蚂蚁有点生锈，但它是这样的行：

The -cp (and -classpath) arguments are ignored when using -jar argument. You need to specify it in the Class-Path attribute of JAR's MANIFEST.MF file.

My ant is a bit rusty, but it's something like those lines:

---

更新你的评论，你想知道如何直接使用Eclipse，而不是麻烦与蚂蚁。首先，您需要使用 Ctrl + F11 运行建议的 main（）方法，然后右键单击项目，选择导出> 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，请选择库处理），然后单击完成。这样，当生成 MANIFEST 文件时，Eclipse将自动考虑buildpath的详细信息。

---

Update as per your comments you'd like to know how to do this directly with Eclipse instead of hassling with Ant. First, you need to run the proposed main() method using Ctrl+F11 and then rightclick the project, choose Export > Runnable JAR file (note "Runnable" part, this is important!). Then, in the Wizard you have to choose the same Launch configuration from the list (and if necessary choose library handling) and then click Finish. This way Eclipse will take the buildpath details automagically into account when generating the MANIFEST file.

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