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a crazy java problem

Started bymcheung63@gmail.com
First post2017-11-10 18:41 -0800
Last post2017-11-10 22:53 -0500
Articles 3 — 2 participants

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  a crazy java problem mcheung63@gmail.com - 2017-11-10 18:41 -0800
    Re: a crazy java problem mcheung63@gmail.com - 2017-11-10 18:43 -0800
      Re: a crazy java problem Arne Vajhøj <arne@vajhoej.dk> - 2017-11-10 22:53 -0500

#37648 — a crazy java problem

Frommcheung63@gmail.com
Date2017-11-10 18:41 -0800
Subjecta crazy java problem
Message-ID<33ab661b-810a-4d40-86ef-907752ec35aa@googlegroups.com>
Hi All
   this code can run successfull in a simple java main():

		try {
			System.out.println(System.getProperty("java.version"));
			String str = CommonLib.runCommand("C:\\Program Files (x86)\\Graphviz2.38\\bin\\dot.exe -Tpng C:\\Users\\Peter\\AppData\\Local\\Temp\\1.asm6434829820851445658.dot -o C:\\Users\\Peter\\desktop\\1.asm3568795673124410656.png");
			System.out.println("str=" + str);
		} catch (Exception ex) {
			ex.printStackTrace();
		}


But if running inside the netbeans plugin module, it throws an exception:

java.io.IOException: CreateProcess error=2, The system cannot find the file specified
	at java.lang.ProcessImpl.create(Native Method)
	at java.lang.ProcessImpl.<init>(ProcessImpl.java:386)
	at java.lang.ProcessImpl.start(ProcessImpl.java:137)
	at java.lang.ProcessBuilder.start(ProcessBuilder.java:1029)
Caused: java.io.IOException: Cannot run program "C:\Program": CreateProcess error=2, The system cannot find the file specified
	at java.lang.ProcessBuilder.start(ProcessBuilder.java:1048)
	at java.lang.Runtime.exec(Runtime.java:620)
	at java.lang.Runtime.exec(Runtime.java:450)
	at java.lang.Runtime.exec(Runtime.java:347)
	at com.peterswing.CommonLib.runCommand(CommonLib.java:730)
	at com.peterswing.CommonLib.runCommand(CommonLib.java:721)
[catch] at com.github.mcheung63.netbeans.antlr.FileTypeG4VisualElement.jButton1ActionPerformed(FileTypeG4VisualElement.java:249)
	at com.github.mcheung63.netbeans.antlr.FileTypeG4VisualElement.access$500(FileTypeG4VisualElement.java:44)
	at com.github.mcheung63.netbeans.antlr.FileTypeG4VisualElement$6.actionPerformed(FileTypeG4VisualElement.java:144)
	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
	at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
	at java.awt.Component.processMouseEvent(Component.java:6533)
	at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
	at java.awt.Component.processEvent(Component.java:6298)

Any hints?
Thanks
From Peter

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#37649

Frommcheung63@gmail.com
Date2017-11-10 18:43 -0800
Message-ID<37cbaf57-b52e-4f12-93c1-e3da6b01c9d9@googlegroups.com>
In reply to#37648
mche...@gmail.com於 2017年11月11日星期六 UTC+8上午10時41分45秒寫道：
> Hi All
>    this code can run successfull in a simple java main():
> 
> 		try {
> 			System.out.println(System.getProperty("java.version"));
> 			String str = CommonLib.runCommand("C:\\Program Files (x86)\\Graphviz2.38\\bin\\dot.exe -Tpng C:\\Users\\Peter\\AppData\\Local\\Temp\\1.asm6434829820851445658.dot -o C:\\Users\\Peter\\desktop\\1.asm3568795673124410656.png");
> 			System.out.println("str=" + str);
> 		} catch (Exception ex) {
> 			ex.printStackTrace();
> 		}
> 
> 
> But if running inside the netbeans plugin module, it throws an exception:
> 
> java.io.IOException: CreateProcess error=2, The system cannot find the file specified
> 	at java.lang.ProcessImpl.create(Native Method)
> 	at java.lang.ProcessImpl.<init>(ProcessImpl.java:386)
> 	at java.lang.ProcessImpl.start(ProcessImpl.java:137)
> 	at java.lang.ProcessBuilder.start(ProcessBuilder.java:1029)
> Caused: java.io.IOException: Cannot run program "C:\Program": CreateProcess error=2, The system cannot find the file specified
> 	at java.lang.ProcessBuilder.start(ProcessBuilder.java:1048)
> 	at java.lang.Runtime.exec(Runtime.java:620)
> 	at java.lang.Runtime.exec(Runtime.java:450)
> 	at java.lang.Runtime.exec(Runtime.java:347)
> 	at com.peterswing.CommonLib.runCommand(CommonLib.java:730)
> 	at com.peterswing.CommonLib.runCommand(CommonLib.java:721)
> [catch] at com.github.mcheung63.netbeans.antlr.FileTypeG4VisualElement.jButton1ActionPerformed(FileTypeG4VisualElement.java:249)
> 	at com.github.mcheung63.netbeans.antlr.FileTypeG4VisualElement.access$500(FileTypeG4VisualElement.java:44)
> 	at com.github.mcheung63.netbeans.antlr.FileTypeG4VisualElement$6.actionPerformed(FileTypeG4VisualElement.java:144)
> 	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
> 	at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
> 	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
> 	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
> 	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
> 	at java.awt.Component.processMouseEvent(Component.java:6533)
> 	at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
> 	at java.awt.Component.processEvent(Component.java:6298)
> 
> Any hints?
> Thanks
> From Peter


	public static String runCommand(String command, int skipLine) throws Exception {
		StringBuffer sb = new StringBuffer(4096);
		int x = 0;
		String s;
		Process p = Runtime.getRuntime().exec(command);

		BufferedReader stdInput = new BufferedReader(new InputStreamReader(p.getInputStream()));

		// read the output from the command
		while ((s = stdInput.readLine()) != null) {
			if (x >= skipLine) {
				sb.append(s);
				sb.append(System.getProperty("line.separator"));
			}
			x++;
		}
		stdInput.close();
		return sb.toString();
	}

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#37650

FromArne Vajhøj <arne@vajhoej.dk>
Date2017-11-10 22:53 -0500
Message-ID<ou5s7h$97m$1@gioia.aioe.org>
In reply to#37649
On 11/10/2017 9:43 PM, mcheung63@gmail.com wrote:
> mche...@gmail.com於 2017年11月11日星期六 UTC+8上午10時41分45秒寫道：
>>     this code can run successfull in a simple java main():

>> 			String str = CommonLib.runCommand("C:\\Program Files (x86)\\Graphviz2.38\\bin\\dot.exe -Tpng C:\\Users\\Peter\\AppData\\Local\\Temp\\1.asm6434829820851445658.dot -o C:\\Users\\Peter\\desktop\\1.asm3568795673124410656.png");

>> But if running inside the netbeans plugin module, it throws an exception:
>>
>> java.io.IOException: CreateProcess error=2, The system cannot find the file specified

>> Caused: java.io.IOException: Cannot run program "C:\Program": CreateProcess error=2, The system cannot find the file specified

>> Any hints?

> 	public static String runCommand(String command, int skipLine) throws Exception {

> 		Process p = Runtime.getRuntime().exec(command);

I am more puzzled over why it sometimes work.

As I read the JavaDoc for Runtime.exec overloads then command line
get parsed to parts simply by splitting at spaces. That does not
find the correct command.

So I will suggest:

String str = CommonLib.runCommand(new String[] { "C:\\Program Files 
(x86)\\Graphviz2.38\\bin\\dot.exe", "-Tpng", 
"C:\\Users\\Peter\\AppData\\Local\\Temp\\1.asm6434829820851445658.dot", 
"-o", "C:\\Users\\Peter\\desktop\\1.asm3568795673124410656.png" });

public static String runCommand(String[] cmdarr, int skipLine) throws 
Exception {

Process p = Runtime.getRuntime().exec(cmdarr);

Arne

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