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a crazy java problem

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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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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

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