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POHow to load AttachProvider (attach.dll) dynamically
 

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  1. POHow to load AttachProvider (attach.dll) dynamically
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    <p>I'm using <code>com.sun.tools.attach</code> from jdk's <code>tools.jar</code> and it need an specified <code>java.library.path</code> env pointing to <code>attach.dll</code> at startup to properly instatiate provider such as <code>WindowsAttachProvider</code>. For some reasons I need to dynamic loading one of bundled <code>attach.dll</code>. I'm try to use some like this:</p> <pre><code>public static void main(String[] args) throws Exception { Path bin = Paths.get(System.getProperty("user.dir"),"bin").toAbsolutePath(); switch (System.getProperty("os.arch")) { case "amd64": bin = bin.resolve("win64"); break; default: bin = bin.resolve("win32"); } // Dynamic setting of java.library.path only seems not sufficient System.setProperty("java.library.path", System.getProperty("java.library.path") + File.pathSeparator + bin.toString()); // So I try to manual loading attach.dll. This is not sufficient too. System.load(bin.resolve("attach.dll").toString()); // I'm using com.sun.tools.attach in my app new myApp(); } </code></pre> <p>If I run this out of jdk (in normall jre) it's report to me:</p> <pre><code>java.util.ServiceConfigurationError: com.sun.tools.attach.spi.AttachProvider: Provider sun.tools.attach.WindowsAttachProvider could not be instantiated: java.lang.UnsatisfiedLinkError: no attach in java.library.path Exception in thread "main" com.sun.tools.attach.AttachNotSupportedException: no providers installed at com.sun.tools.attach.VirtualMachine.attach(... </code></pre> <p>How to install attach provider without specifying <code>-Djava.library.path</code> to point <code>attach.dll</code> at startup?</p>
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    1. CODid you try printing (or debugging) the paths you are forming to see if they are what you expect?
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    2. COYes, I'm printing it before and after and they are what I expect. It seems like an attach api use this env on startup only.
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    3. COYou can't change java.library.path programatically by setting the system property. There are hacks using reflection. But you probably want to find another solution.
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