构建路径条目丢失

Question

I have copied my project from one system to another,now I am trying to run it,I am having a message in build path that 95 build path entries are missing. I am having main problem with importing some packages like:

import net.sf.jasperreports.engine.JRException;

import net.sf.jasperreports.engine.JRField


import net.sf.jasperreports.engine.*;

import net.sf.jasperreports.engine.design.JasperDesign;

import net.sf.jasperreports.engine.xml.JRXmlLoader;

import com.mysql.jdbc.Connection;

import com.mysql.jdbc.PreparedStatement;


import com.mysql.jdbc.Statement;

import org.krysalis.barcode4j.BarcodeDimension;


import org.krysalis.barcode4j.HumanReadablePlacement;

import org.krysalis.barcode4j.impl.AbstractBarcodeBean;

import org.krysalis.barcode4j.impl.code128.Code128Bean;

import org.krysalis.barcode4j.impl.upcean.EAN13Bean;

import org.krysalis.barcode4j.output.java2d.Java2DCanvasProvider;

import org.jdesktop.swingx.JXTaskPane;

import org.jdesktop.swingx.JXTaskPaneContainer;

import orgimp.pushingpixels.substance.api.SubstanceLookAndFeel;

import org.pushingpixels.substance.api.SubstanceSkin;

Answer 1

if you are using eclipse ,then right click on project

Properties->java build path
now check source all class file src is added or not,
check libraries that all necessary jar is added or not

if yor are running through comand prompt then you need to set path in command line 

Answer 2

right click on project

go to properties-->java build path--->Libraries

add all library that needs in your project

and also check your java compiler

go to properties-->java compiler

choose necessary java compiler

------------------------------- OR ---------------------------------------------

it may be possible that required jar files are not present in your lib folder

Answer 3

尝试从构建路径中删除这些条目（确保您离开了Eclipse已经可以找到的jars）。