java - Unable to import project in eclipse: "Impossible to find or load the main class" -


i've imported this project on eclipse workspace. after time spent find correct jar dependencies, i've tried run project, says me it's impossible find or load main class.

to import project, downloaded , imported on eclipse using file -> import. there problems dependencies (there classes eclipse couldn't find), downloaded jars of these dependencies , included in project.

this code of mainclass:

package com.yeokhengmeng.docstopdfconverter; import java.io.file; import java.io.fileinputstream; import java.io.filenotfoundexception; import java.io.fileoutputstream; import java.io.ioexception; import java.io.inputstream; import java.io.outputstream;  import org.kohsuke.args4j.cmdlineexception; import org.kohsuke.args4j.cmdlineparser; import org.kohsuke.args4j.option;    public class mainclass{       public static final string version_string = "\ndocs pdf converter version 1.7 (8 dec 2013)\n\nthe mit license (mit)\ncopyright (c) 2013-2014 yeo kheng meng";     public enum doc_type {         doc,         docx,         ppt,         pptx,         odt     }      public static void main(string[] args){         converter converter;          try{             converter = processarguments(args);         } catch (exception e){             system.out.println("\n\ninput\\output file not specified properly.");             return;         }           if(converter == null){             system.out.println("unable determine type of input file.");         } else {             try {                 converter.convert();             } catch (exception e) {                 e.printstacktrace();             }         }      }       public static converter processarguments(string[] args) throws exception{         commandlinevalues values = new commandlinevalues();         cmdlineparser parser = new cmdlineparser(values);          converter converter = null;         try {             parser.parseargument(args);              boolean version = values.version;              if(version){                 system.out.println(version_string);                 system.exit(0);             }               string inpath = values.infilepath;             string outpath = values.outfilepath;             boolean shouldshowmessages = values.verbose;               if(inpath == null){                 parser.printusage(system.err);                 throw new illegalargumentexception();             }              if(outpath == null){                 outpath = changeextensiontopdf(inpath);             }               string lowercaseinpath = inpath.tolowercase();              inputstream instream = getinfilestream(inpath);             outputstream outstream = getoutfilestream(outpath);              if(values.type == null){                 if(lowercaseinpath.endswith("doc")){                     converter = new doctopdfconverter(instream, outstream, shouldshowmessages, true);                 } else if (lowercaseinpath.endswith("docx")){                     converter = new docxtopdfconverter(instream, outstream, shouldshowmessages, true);                 } else if(lowercaseinpath.endswith("ppt")){                     converter = new ppttopdfconverter(instream, outstream, shouldshowmessages, true);                 } else if(lowercaseinpath.endswith("pptx")){                     converter = new pptxtopdfconverter(instream, outstream, shouldshowmessages, true);                 } else if(lowercaseinpath.endswith("odt")){                     converter = new odttopdf(instream, outstream, shouldshowmessages, true);                 } else {                     converter = null;                 }               } else {                  switch(values.type){                 case doc: converter = new doctopdfconverter(instream, outstream, shouldshowmessages, true);                 break;                  case docx: converter = new docxtopdfconverter(instream, outstream, shouldshowmessages, true);                 break;                 case ppt:  converter = new ppttopdfconverter(instream, outstream, shouldshowmessages, true);                 break;                 case pptx: converter = new pptxtopdfconverter(instream, outstream, shouldshowmessages, true);                 break;                 case odt: converter = new odttopdf(instream, outstream, shouldshowmessages, true);                 break;                 default: converter = null;                 break;                  }               }          } catch (cmdlineexception e) {             // handling of wrong arguments             system.err.println(e.getmessage());             parser.printusage(system.err);         }          return converter;      }       public static class commandlinevalues {          @option(name = "-type", aliases = "-t", required = false, usage = "specifies doc converter. leave blank let program decide input extension.")         public doc_type type = null;           @option(name = "-inputpath", aliases = {"-i", "-in", "-input"}, required = false,  metavar = "<path>",                 usage = "specifies path input file.")         public string infilepath = null;           @option(name = "-outputpath", aliases = {"-o", "-out", "-output"}, required = false, metavar = "<path>",                 usage = "specifies path output pdf.")         public string outfilepath = null;          @option(name = "-verbose", aliases = {"-v"}, required = false, usage = "to see intermediate processing messages.")         public boolean verbose = false;          @option(name = "-version", aliases = {"-ver"}, required = false, usage = "to view version code.")         public boolean version = false;       }      //from http://stackoverflow.com/questions/941272/how-do-i-trim-a-file-extension-from-a-string-in-java     public static string changeextensiontopdf(string originalpath) {  //      string separator = system.getproperty("file.separator");         string filename = originalpath;  //      // remove path upto filename. //      int lastseparatorindex = originalpath.lastindexof(separator); //      if (lastseparatorindex == -1) { //          filename = originalpath; //      } else { //          filename = originalpath.substring(lastseparatorindex + 1); //      }          // remove extension.         int extensionindex = filename.lastindexof(".");          string removedextension;         if (extensionindex == -1){             removedextension =  filename;         } else {             removedextension =  filename.substring(0, extensionindex);         }         string addpdfextension = removedextension + ".pdf";          return addpdfextension;     }       protected static inputstream getinfilestream(string inputfilepath) throws filenotfoundexception{         file infile = new file(inputfilepath);         fileinputstream istream = new fileinputstream(infile);         return istream;     }      protected static outputstream getoutfilestream(string outputfilepath) throws ioexception{         file outfile = new file(outputfilepath);          try{             //make directories specified             outfile.getparentfile().mkdirs();         } catch (nullpointerexception e){             //ignore error since means not parent directories         }          outfile.createnewfile();         fileoutputstream ostream = new fileoutputstream(outfile);         return ostream;     } }

there error in class, neither in other classes of project.

because never included class in packaged jar.

as project uses maven. can see dependencies (jars) available in pom.xml.

https://github.com/yeokm1/docs-to-pdf-converter/blob/master/docs-to-pdf-converter/pom.xml

just import project maven ide.

mvn clean install

sample output running eclipse or normal maven repl :

-------------------------------------------------------  t e s t s -------------------------------------------------------  results :  tests run: 0, failures: 0, errors: 0, skipped: 0  [info] [info] --- maven-jar-plugin:2.3.2:jar (default-jar) @ docs-to-pdf-converter --- [info] building jar: /home/docs-to-pdf-converter/target/docs-to-pdf-converter-1.8.jar [info] [info] --- maven-install-plugin:2.3.1:install (default-install) @ docs-to-pdf-converter --- [info] installing /home/docs-to-pdf-converter/target/docs-to-pdf-converter-1.8.jar /home/**/.m2/repository/docs-to-pdf-converter/docs-to-pdf-converter/1.8/docs-to-pdf-converter-1.8.jar [info] installing /home/docs-to-pdf-converter/pom.xml /home/**/.m2/repository/docs-to-pdf-converter/docs-to-pdf-converter/1.8/docs-to-pdf-converter-1.8.pom [info] ------------------------------------------------------------------------ [info] build success [info] ------------------------------------------------------------------------ [info] total time: 2.346s [info] finished at: fri aug 18 06:18:31 edt 2017 [info] final memory: 23m/475m [info] ------------------------------------------------------------------------

my environment :

java : 1.8.0_141 , maven : apache maven 3.0.5

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