我在Tomcat 7中为共享库提供了Custom Shared ClassLoader。我们迁移到tomcat 9，它无法正常工作。如何在tomcat9中实现相同的功能

Question

我在Tomcat 7中有Custom SharedClassLoader来加载共享库jar，这是由tomcat中的不同应用程序使用的。我们迁移到Tomcat 9，现在它无法运行。如何在tomcat 9中实现相同的功能。

在Tomcat 9中，它希望传递资源。我没有找到任何关于如何填充资源的示例代码。

我尝试过如下

public CustomSharedClassLoader(ClassLoader parent) throws Exception {
        super(parent);

//The below three lines are added by me to work for Tomcat 9.        
        StandardRoot standardRoot = new StandardRoot();
        standardRoot.addPreResources(new DirResourceSet());
        setResources(standardRoot);
// End for tomcat 9 changes.

        for (URL urlForJars : getClassPath(SHARED_LIB)) {
            addURL(urlForJars);
        }
        start();
    }

它没用。

public class CustomSharedClassLoader extends WebappClassLoader{
//Which takes shared folder libarary, it returns those classes.
} 

Answer 1

您可以在catalina.properties中添加共享类

shared.loader=${catalina.home}/shared/classes,${catalina.home}/shared/*.jar

文档：

# List of comma-separated paths defining the contents of the "shared"
# classloader. Prefixes should be used to define what is the repository type.
# Path may be relative to the CATALINA_BASE path or absolute. If left as blank,
# the "common" loader will be used as Catalina's "shared" loader.
# Examples:
#     "foo": Add this folder as a class repository
#     "foo/*.jar": Add all the JARs of the specified folder as class
#                  repositories
#     "foo/bar.jar": Add bar.jar as a class repository
# Please note that for single jars, e.g. bar.jar, you need the URL form
# starting with file:.