spring打包jar后，freemarker报错：cannot be resolved to absolute file path because it does not reside in the

矫情吗；* 2023-09-26 09:34 11阅读 0赞

## spring打包jar后，freemarker报错：cannot be resolved to absolute file path because it does not reside in the file system: ##

> java.io.FileNotFoundException: class path resource \[mytemp/\] cannot be resolved to absolute file path because it does not reside in the file system: jar:file:/我的jar包所在位置!/BOOT-INF/classes!/mytemp/

现象：用idea做了一个简单的spring web工程，用freemarker作为模板框架，事先将一个模板文件：demo\_temp.yaml放到工程的resources/mytemp目录下面，mytemp是我自己新建的目录，最终，模板文件在项目中的路径是resources/mytemp/demo\_temp.yaml。按照freemarker的例子，在代码中：

...
    
    freemarker.template.Configuration cfg = new freemarker.template.Configuration(freemarker.template.Configuration.VERSION_2_3_29);
    
    Resource resource = new ClassPathResource("mytemp/");
    cfg.setDirectoryForTemplateLoading(resource.getFile());
    
    ...

以上代码在本地跑没有问题，可以正常从resources/mytemp/temp\_demo.yaml文件加载出来并正确赋值生成，但是把项目打包成一个jar文件，通过命令

java -jar xxx.jar

运行后，freemarker报错，错误代码在：cfg.setDirectoryForTemplateLoading(resource.getFile());

原因是当没有打包，在本地时候，Java系统可以通过文件系统方式访问到demo\_temp.yaml，但是打包成jar文件后，就没有普通本地上那种文件路径，导致找不到demo\_yaml文件。

解决方案，换掉原先的以文件路径方式（setDirectoryForTemplateLoading）的模板加载方式，改用类路径访问：

freemarker.template.Configuration configuration = new freemarker.template.Configuration(freemarker.template.Configuration.VERSION_2_3_29);
            configuration.setClassLoaderForTemplateLoading(getClass().getClassLoader(),"/mytemp/");

特别注意打头的 / ，mytemp前面的 / 需要加。如果没有 / , 系统将会只在当前类的包下寻找mytemp/demo\_temp.yaml，如果是 /mytemp/ 系统将会在整个工程代码的根目录出发寻找。

这里freemarker官方文档对setClassForTemplateLoading给出的解释：

>  *  `void setClassForTemplateLoading(Class cl, String basePackagePath)` and `void setClassLoaderForTemplateLoading(ClassLoader classLoader, String basePackagePath)`: These are for when you want to load templates via the same mechanism with which Java loads classes (from the class-path, as they used to say vaguely). This is very likely be the preferred means of loading templates for production code, as it allows you to keep everything inside the deployment `jar` files. The first parameter decides which Java `ClassLoader` will be used. The second parameter specifies the package that contains the templates, in `/`\-separated format. Note that if you don't start it with `/`, it will be interpreted relatively to the package of the `Class` parameter.

出处链接：

[Template loading - Apache FreeMarker Manual![favicon.png][]https://freemarker.apache.org/docs/pgui\_config\_templateloading.html][Template loading - Apache FreeMarker Manual_favicon.png_https_freemarker.apache.org_docs_pgui_config_templateloading.html]

[favicon.png]: https://freemarker.apache.org/docs/favicon.png
[Template loading - Apache FreeMarker Manual_favicon.png_https_freemarker.apache.org_docs_pgui_config_templateloading.html]: https://freemarker.apache.org/docs/pgui_config_templateloading.html

spring打包jar后，freemarker报错：cannot be resolved to absolute file path because it does not reside in the

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