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Why wont this .jar file run when I try to start it on C#? [closed]

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I'm very new to the coding space and was wondering if someone could help me start a .jar file. BTW This is using C#. My issue is this wont run the file. I got it to work with .txt files though, so I'm just a bit confused.
private void button1_Click(object sender, EventArgs e)
{
Process.Start("java" , "server.jar");
}

In short, for the answer, add -jar right before the JAR file name.
The accepted answer is not 100% correct for several reasons: it does not recognize whitespace-delimited and whitespace-containing arguments, and may mess up with quote characters that must be passed (therefore properly escaped) to the delegated Java app. In short, do not use Arguments if the string is not known to be a constant (having spaces will require manual escaping anyway), but merely prefer ArgumentList that handles each argument properly.
Here is an example Java application to deal with command line arguments:
public final class SayHello {
private SayHello() {}
public static void main(final String... names) {
for ( final String name : names ) {
System.out.printf("hello %s!\n", name);
}
}
}
The manifest for the JAR file:
Manifest-Version: 1.0
Main-Class: SayHello
Making a JAR file out of it is simple:
javac SayHello.java
jar cfm SayHello.jar MANIFEST.MF SayHello.class
Example of use:
java -jar SayHello.jar 'John Doe' Anonymous
that gives:
hello John Doe!
hello Anonymous!
Now, an example C# program that passes the -jar argument to the java process so that it recognizes the given file as a JAR file and demonstrates what can go wrong with Arguments if passed as a string.
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net5.0</TargetFramework>
</PropertyGroup>
</Project>
using System.Diagnostics;
public static class SayHello {
public static void Main() {
// interprets 3 names: John, Doe, Anonymous (wrong)
RunJavaJarBadly1("SayHello.jar", "John Doe Anonymous");
// interprets 1 name: John Doe Anonymous (wrong)
RunJavaJarBadly2("SayHello.jar", "John Doe Anonymous");
// interprets 2 names: John Doe, Anonymous (correct, but bad: requires the first name to be quoted at the call-site)
RunJavaJarBadly1("SayHello.jar", "\"John Doe\" Anonymous");
// interprets 1 name: "John Doe" Anonymous (wrong: interprets everything as a single name)
RunJavaJarBadly2("SayHello.jar", "\"John Doe\" Anonymous");
// interprets 2 names, no ambiguous call, each name is recognized properly, does not require quoting at the call site
RunJavaJar("SayHello.jar", "John Doe", "Anonymous");
}
private static void RunJavaJarBadly1(string jarPath, string argumentsFortheJarFile) {
var process = new Process();
process.StartInfo.FileName = "java";
process.StartInfo.Arguments = #"-jar "+ jarPath +" " + argumentsFortheJarFile;
process.Start();
process.WaitForExit();
}
private static void RunJavaJarBadly2(string jarPath, string jarArgs) {
var process = new Process();
process.StartInfo = new ProcessStartInfo("java") {
ArgumentList = { "-jar", jarPath, jarArgs }
};
process.Start();
process.WaitForExit();
}
private static void RunJavaJar(string jarPath, params string[] jarArgs) {
var process = new Process();
process.StartInfo = new ProcessStartInfo("java") {
ArgumentList = { "-jar", jarPath }
};
foreach ( var jarArg in jarArgs ) {
process.StartInfo.ArgumentList.Add(jarArg);
}
process.Start();
process.WaitForExit();
}
}
The code above produces (no legend in the output, but added for explanation):
hello John! \_ #1/1: incorrect, the space is ignored
hello Doe! /
hello Anonymous! -- #1/2: correct, no spaces in-between
hello John Doe Anonymous! -- #2/1|2: incorrect
hello John Doe! -- #3/1: correct, but requires the call site to escape the argument
hello Anonymous! -- #3/2: correct, no need to escape, thanks to no spaces
hello "John Doe" Anonymous! -- #4/1|2: incorrect, similar to #2/1|2
hello John Doe! -- #5/1: correct, let the framework do its job
hello Anonymous! -- #5/2: correct, let the framework do its job

In order to get it to work, the file name needs to be "java" and contain the file location in the arguments.
System.Diagnostics.Process clientProcess = new Process();
clientProcess.StartInfo.FileName = "java";
clientProcess.StartInfo.Arguments = #"-jar "+ jarPath +" " + argumentsFortheJarFile;
clientProcess.Start();
clientProcess.WaitForExit();
int code = clientProcess.ExitCode;
Taken from similar question here
Optional way using ArgumentList:
System.Diagnostics.Process clientProcess = new Process();
var info = new System.Diagnostics.ProcessStartInfo("java.exe")
{
ArgumentList = {
"-jar",
jarPath,
jarArgs
}
};
info.FileName = "java";
clientProcess.StartInfo = info;
clientProcess.Start();
clientProcess.WaitForExit();
int code = clientProcess.ExitCode;

Here are some options for you to check out.
Also similar question with a working result: here
Paraphrasing from links:
In order to get it to work, the file name needs to be "java" and contain the file location in the arguments.
System.Diagnostics.Process clientProcess = new Process();
clientProcess.StartInfo.FileName = "java";
clientProcess.StartInfo.Arguments = #"-jar "+ jarPath +" " + argumentsFortheJarFile;
clientProcess.Start();
clientProcess.WaitForExit();
int code = clientProcess.ExitCode;

Throwing error from grammar to java in antlr3 [closed]

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How can I throw the custom error message from the grammar file to the java class(where the parsing and lexing are defined)?
<----------Parser Grammar----------->
parser grammar EParser;
#members {
public void displayRecognitionError(String[] tokenNames, RecognitionException e) {
String hdr = getErrorHeader(e);
String msg = getErrorMessage(e, tokenNames);
System.out.println("hdr and msg...."+hdr+">>>>>>"+msg);
throw new RuntimeException(hdr + ":" + msg);
}
}
prog
: stat+
;
stat
: expr SEMI
| ID EQU expr SEMI
;
expr
: multExpr ((PRM) multExpr)*
;
multExpr
: atom (MUL atom)*
;
atom
:INT| OPEN expr CLS
;
<-------------------Java code--------------->
import org.antlr.runtime.*;
import org.antlr.runtime.tree.*;
public class TestE {
public static void main(String[] args) throws Exception {
ELexer lexer = new ELexer(new ANTLRStringStream("a=9+8;"));
EParser parser = new EParser(new CommonTokenStream(lexer));
try
{
parser.prog();
System.out.println("Parsing successfully...");
}
catch (Exception e)
{
System.out.println("Other exception : " + e.toString());
}
}
}
<------------------Lexer grammar-------------->
lexer grammar ELexer;
tokens
{
ID;
INT;
WS;
EQU;
PRM;
OPEN;
CLS;
SEMI;
MUL;
}
#members {
Stack<String> paraphrase = new Stack<String>();
}
ID :('a'..'z'|'A'..'Z')+ ;
INT : '0'..'9'+ ;
EQU:'=';
PRM:'+'|'-';
OPEN:'(';
SEMI:';';
CLS :')';
MUL:'*';
WS : (' '|'\t'|'\n'|'\r')+ {skip();} ;
Here my input is a=9+8.
When I miss 8 it must give the error message as "Expecting an integer", and when I miss ; it must say "Missing semicolon".
Like this I have to produce the error message (I don't want the default error message that was produced by the antlr, I need my own error msgs).
How can I achieve this? Whether I have to write the error messages in the grammar file? Or the java code?

You don't need to throw custom errors in your grammar. Instead you install your custom error handler and handle exceptions in there. I have written a fairly complete error handling (however, for the ANTLR3 C target). It might give you some hints what you can use to construct your own error messages.

For Java target, you might want to override one or more of these methods:
org.antlr.runtime.BaseRecognizer.getErrorHeader()
creates error header (where in the input the error occurred)
org.antlr.runtime.BaseRecognizer.getErrorMessage()
creates the error message itself (what happened)
org.antlr.runtime.BaseRecognizer.emitErrorMessage()
displays the error (by default on error output / console)
org.antlr.runtime.BaseRecognizer.displayRecognitionError()
glues it all together:
public void displayRecognitionError(String[] tokenNames,
RecognitionException e)
{
String hdr = getErrorHeader(e);
String msg = getErrorMessage(e, tokenNames);
emitErrorMessage(hdr+" "+msg);
}
You can override them in #members section of the grammar as you already did with displayRecognitionError(), or if it's longer code it's more convenient to subclass the org.antlr.runtime.Parser and put superClass = MyParser; in the grammar's options section (note that to do it this way for lexer errors as well, you'll have to create a subclass of org.antlr.runtime.Lexer as well for the lexer to use).

Static Java function imported with rJava doesn't work with tm_map()

I've prepared a class with a static method in Java 6, which I've exported to a JAR file:
package pl.poznan.put.stemutil;
public class Stemmer {
public static String stemText(String text) {
Set<String> c = new HashSet<String>();
...
return StringUtils.join(c, " ");
}
}
I import it to R with following code:
require(rJava)
.jinit("java/stem-util.jar")
stem = J("pl.poznan.put.stemutil.Stemmer")$stemText
Then, when I call it directly it works, e.g:
> stem("płotkami")
[1] "płotek płotka"
But when I'll try to use it with tm_map() function, something goes wrong:
> vc = VCorpus(vs, readerControl = list(language = "pl"))
> vc[[1]]
<<PlainTextDocument (metadata: 7)>>
mirki mirkówny zaczynam wolne jutra ( ͡° ͜ʖ ͡°) #pijzwykopem #piwozlidla
> vc = tm_map(vc, stem)
Komunikat ostrzegawczy:
In mclapply(content(x), FUN, ...) :
all scheduled cores encountered errors in user code
> vc[[1]]
[1] "Error in FUN(X[[1L]], ...) : \n Sorry, parameter type `NA' is ambiguous or not supported.\n"
attr(,"class")
[1] "try-error"
attr(,"condition")
<simpleError in FUN(X[[1L]], ...): Sorry, parameter type `NA' is ambiguous or not supported.>
What am I doing incorrectly?

Finally adding mc.cores parameter has worked for me. However, It's more a workaround, than a proper solution.
vc = tm_map(vc, content_transformer(stem), mc.cores=1)

Passing query from php to java

i em trying to fetch some query from an url and then pass them to a java program for further execution. The problem i am facing is that my php code is calling my java program but is not passing the values.
till now i have worked on these codes,
PHP PROGRAM:
<?php
$phonecode= $_GET['phonecode'];
$keyword= $_GET['keyword'];
$location= $_GET['location'];
exec("C:\Users\Abc\Documents\NetBeansProjects\JavaApplication11\src\javaapplication11\main.java -jar jar/name.jar hello" . $phonecode . ' ' . $keyword . ' ' . $location, $output);
print_r($output);
?>
JAVA PROGRAM:
public class Main
{
public static void main(String args[])
{
try
{
String phonecode = args[];
System.out.println(args[]);
System.out.println(phonecode);// i have only tried to print phonecode for now
}
catch(Exception e)
{
System.out.println(e);
}
}
}

Ok, a couple of issues with the Java code you've posted, here's a working version of what you posted:
class Main
{
public static void main(String[] args)//String[] args, not String args[]
{
if (args.length == 0)
{//check to see if we received arguments
System.out.println("No arguments");
return;
}
if ( args.length < 3)
{//and make sure that there are enough args to continue
System.out.println("To few arguments");
return;
}
try
{//this try-catch block can be left out
String phonecode = args[0];//first arg
String keyword = args[1];//second
String location = args[2];//third
//print out the values
System.out.print("Phonecode: ");
System.out.println(phonecode);
System.out.print("keyword: ");
System.out.println(keyword);
System.out.print("location: ");
System.out.println(location);
}
catch(Exception e)
{
System.out.println(e.getMessage());//get the exception MESSAGE
}
}
}
Now, save that as a .java file, and compile it, it should churn out a Main.class file. I compiled it from the command-line:
javac main.java
I don't have netbeans installed, but I suspect the .class file will be written to a different directory, something like:
C:\Users\Abc\Documents\NetBeansProjects\JavaApplication11\bin\javaapplication11\Main.class
// note the BIN
Then, to execute, you need to run the java command, and pass it the path to this Main.class file, leaving out the .class extension. Thus, we end up with:
java /path/to/Main 123 keywrd loc
Should result in the output:
Phonecode: 123
keyword: keywrd
location: loc
In your PHP code:
exec('java /path/to/Main '.escapeshellarg($phonecode). ' '.escapeshellarg($keyword).' '.escapeshellarg($location), $output, $status);
if ($status === 0)
{//always check exit code, 0 indicates success
var_dump($output);
}
else
exit('Error: java exec failed: '.$status);
There are a couple of other issues, too: like $phonecode = $_GET['phonecode']; doesn't check if that $_GET param exists. If it doesn't your code will emit notices. To fix:
$phonecode = isset($_GET['phonecode']) ? $_GET['phonecode'] : '';
Other niggles include: the backslash is a special char in strings, it is used in escape sequences: \n is a newline char. PHP can deal with the *NIX directory separator /, even on windows. Use that, or escape the backslashes (C:\\Users\\Abc\\ and so on).
A file that only contains PHP code doesn't require the closing ?> tag. In fact: it is recommended you leave it out.

your java code should look like
public static void main (String[] args) {
for (String s: args) {
System.out.println(s);
}
}
Note String[] args, not String args[]
Also on PHP side in exec you need space between string hello, and variable $phonecode if you want those to be looked as a 2 separate arguments.

JRuby class and Java Scripting Engine unexpected results

I'm experimenting with the Java scripting engine and Ruby, and I'm having trouble setting some instance variables in a ruby script. This could be my lack of understanding of Ruby or my lack of understanding of how to use ruby classes in the scripting engine. With the following code:
public class App {
public static void main( String[] args ) throws Exception{
ScriptEngineManager sm = new ScriptEngineManager();
ScriptEngine se = sm.getEngineByName("jruby");
StringBuilder sb = new StringBuilder();
sb.append("class Test\n");
sb.append(" attr_accessor :a, :b\n");
sb.append(" def str\n");
sb.append(" \"#{a}, #{b} is a test.\"\n");
sb.append(" end\n");
sb.append("end\n");
sb.append("o = Test.new\n");
Object o = se.eval(sb.toString());
se.put("#a", "A");
se.put("#b", "B");
System.out.println( ((Invocable) se).invokeMethod(o, "str"));
}
}
I'd expect the output to be 'A, B is a test'
Instead, the output is ', is a test'.
How should I be setting variables a, b in this code?
Edit: Just to be clear, ideally I don't want to be setting the variables by appending them to this StringBuilder - this is just for illustration. In practice, I'll be loading scripts from some source, and then want to set properties and call methods on that Ruby object afterwards. I'm sure I'm just missing some crucial step that everyone else knows about :). Thanks to Gareth Davis' answer I've found I can use bindings and global variables successfully, but that isn't going to work with all scripts. Would really appreciate any links to good articles that go beyond 'hello world' type usage, as I've not found any decent ones.
Second edit: This is the working, final code, with the crucial line that I knew must be missing :)-
public class App {
public static void main( String[] args ) throws Exception{
//Must set this property if you want to call eval multiple times!
System.setProperty("org.jruby.embed.localvariable.behavior", "persistent");
ScriptEngineManager sm = new ScriptEngineManager();
ScriptEngine se = sm.getEngineByName("jruby");
StringBuilder sb = new StringBuilder();
sb.append("class Test\n");
sb.append(" attr_accessor :a, :b\n");
sb.append(" def str\n");
sb.append(" \"#{a}, #{b} is a test.\"\n");
sb.append(" end\n");
sb.append("end\n");
sb.append("o = Test.new\n");
Object o = se.eval(sb.toString());
se.eval("o.a = \"A\"");
se.eval("o.b = \"B\"");
System.out.println( ((Invocable) se).invokeMethod(o, "str"));
}
}

That won't work like that. The only way to set the values of a & b is to evaluate o.a = 'A' and o.b = 'B'.
The first solution is to amend the script to populate the values thus:
sb.append("o.a = 'A'\n");
sb.append("o.b = 'B'\n");
sb.append("o");
Object o = se.eval(sb.toString());
I've created a working example on github.com
keeping with the question the following can be used (credit to #Mick Sear):
System.setProperty("org.jruby.embed.localvariable.behavior", "persistent");
// .. snip
Object o = se.eval(sb.toString());
se.eval("o.a = 'A'");
se.eval("o.b = 'B'");
System.out.println( ((Invocable) se).invokeMethod(o, "str"));