在 OSGi 中运行 JAI

发布于 2024-08-05 22:42:33 字数 906 浏览 12 评论 0原文

我正在尝试在 OSGi 容器（spring-dm）中运行 Java 高级成像（JAI）。我能够访问 JAI 库，但在第一次调用 JAI 时收到以下错误：

Error: Could not load mediaLib accelerator wrapper classes. Continuing in pure Java mode.
Occurs in: com.sun.media.jai.mlib.MediaLibAccessor
com.sun.media.jai.mlib.MediaLibLoadException

DLL 位于类路径上，并在清单中作为 Bundle-NativeCode 库引用。是否可以在 OSGi 中运行本机 JAI DLL？如果是这样，我需要做什么？

（编辑：澄清）

我下载了 Windows JAI 库并从下载包中提取了 JAR 和 DLL。

主要节日：

Manifest-Version: 1.0
Bundle-Name: Java Advanced Imaging
Bundle-SymbolicName: javax.media.jai
Bundle-Version: 1.1.3
Bundle-ClassPath: libs/,
 jai_codec.jar,
 jai_core.jar,
 mlibwrapper_jai.jar
Bundle-RequiredExecutionEnvironment: JavaSE-1.6
Bundle-NativeCode: libs/mlib_jai_mmx.dll; osname=WindowsXP; processor=x86, 
 libs/mlib_jai_util.dll; osname=WindowsXP; processor=x86, 
 libs/mlib_jai.dll; osname=WindowsXP; processor=x86
Export-Package:

原文

I'm trying to run Java Advanced Imaging (JAI) within an OSGi container (spring-dm). I'm able to access the JAI libraries, but receive the following error when I call JAI for the first time:

Error: Could not load mediaLib accelerator wrapper classes. Continuing in pure Java mode.
Occurs in: com.sun.media.jai.mlib.MediaLibAccessor
com.sun.media.jai.mlib.MediaLibLoadException

The DLLs are on the classpath and referenced as Bundle-NativeCode libraries in my Manifest. Is it possible to run the native JAI DLLs within OSGi? If so, what do I need to do?

(edit: clarifications)

I downloaded the Windows JAI library and extracted JARs and DLLs from the download package.

Mainfest:

Manifest-Version: 1.0
Bundle-Name: Java Advanced Imaging
Bundle-SymbolicName: javax.media.jai
Bundle-Version: 1.1.3
Bundle-ClassPath: libs/,
 jai_codec.jar,
 jai_core.jar,
 mlibwrapper_jai.jar
Bundle-RequiredExecutionEnvironment: JavaSE-1.6
Bundle-NativeCode: libs/mlib_jai_mmx.dll; osname=WindowsXP; processor=x86, 
 libs/mlib_jai_util.dll; osname=WindowsXP; processor=x86, 
 libs/mlib_jai.dll; osname=WindowsXP; processor=x86
Export-Package:

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毁梦 2024-08-12 22:42:33

Bundle-NativeCode 块的声明看起来不正确。根据 OSGi 规范（我强烈建议您下载 - 它非常简单），单个平台的所有库都应在同一个子句中指定，因此将其更改为：

Bundle-NativeCode: libs/mlib_jai_mmx.dll; libs/mlib_jai_util.dll; libs/mlib_jai.dll; 
 osname=WindowsXP; 
 processor=x86

一般来说，我不建议滚动您自己的库如果您可以在其他地方找到它们，则捆绑清单会显示（除了本机代码部分之外，这一个非常简单）。在本例中，我在 Spring 存储库中找到了其中的 2 个。它不包括本机代码部分 - 可能是由于许可证问题。

The declaration of the Bundle-NativeCode block doesn't look right. According to the OSGi specification (which I highly recommend you download - it's pretty straight-forward), all libraries for a single platform should be specified in the same clause, so that changes it to:

Bundle-NativeCode: libs/mlib_jai_mmx.dll; libs/mlib_jai_util.dll; libs/mlib_jai.dll; 
 osname=WindowsXP; 
 processor=x86

In general I don't recommend rolling your own bundle manifests if you can find them elsewhere (this one is pretty simple besides the native code part). In this case, I found them 2 of them at the Spring repository. It doesn't include the native code part - probably due to license issues.

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