class-loader | The ClassLoader component provides tools | Web Framework library
kandi X-RAY | class-loader Summary
kandi X-RAY | class-loader Summary
The ClassLoader component provides tools to autoload your classes and cache their locations for performance.
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Top functions reviewed by kandi - BETA
- Fix namespace declarations .
- Find classes .
- Load a class collection .
- Finds a class file .
- Create a class map from a directory .
- Add a prefix .
- Load a class .
- Register the autoloader .
- Unregister the autoloader .
class-loader Key Features
class-loader Examples and Code Snippets
private static ClassLoader getClassLoader(String classLoaderType) {
ClassLoader classLoader = null;
switch (classLoaderType) {
case "SYSTEM":
classLoader = ClassLoader.getSystemClassLoader();
break;
public static String getAbsoluteFilePath(String filename) {
URL resource = ClassLoader.getSystemClassLoader().getResource(filename);
if (resource == null) {
throw new IllegalArgumentException("File: " + filename + " not fo
@Bean
public ClassLoaderTemplateResolver secondaryTemplateResolver() {
ClassLoaderTemplateResolver secondaryTemplateResolver = new ClassLoaderTemplateResolver();
secondaryTemplateResolver.setPrefix("templates-2/");
seconda
Community Discussions
Trending Discussions on class-loader
QUESTION
I am trying to install ROS Melodic using the instructions on wiki.ros.org and stumbled upon some problems.
System software information:
Operating System: Kubuntu 21.10
KDE Plasma Version: 5.22.5
KDE Frameworks Version: 5.86.0
Qt Version: 5.15.2
Kernel Version: 5.13.0-19-generic (64-bit)
Graphics Platform: X11
ProblemI have first followed steps from http://wiki.ros.org/melodic/Installation/Ubuntu and later followed the steps from https://varhowto.com/install-ros-melodic-ubuntu-18-04/#Step_1_%E2%80%94_Install_ROS_Melodic_repo , both with unsuccessful results.
When running sudo apt update
I am getting:
ANSWER
Answered 2021-Dec-12 at 22:41You're getting this error because Melodic is the ros distro for Ubuntu 18.04. As of present the most recent release is Noetic which targets 20.04. The version of Ubuntu you're using does not currently have a supported ROS release, as such your only real option is to downgrade if you want ROS.
QUESTION
I did some research, But due to complexity of this situation, Not working for me.
Child first class loader and Service Provider Interface (SPI)
Like flink or tomcat, My application run as framework with platform and system classloader. Framework load plugin as module and plugin may depend some lib, so make this define:
...ANSWER
Answered 2021-Sep-29 at 13:36ClassLoader
looks for classes in its parent first, and the parent delegates to its parent and so on. With that said, ClassLoaders that are siblings cannot see eachothers classes.
Also the method DriverManager#getDrivers()
internally validates if the caller ClassLoader can load the class with DriverManager#isDriverAllowed(Driver, ClassLoader)
.
this means that even if your Driver
is added to the registration list, it is only added as an instance of DriverInfo
, this means that it would only be loaded on demand (Lazy), and still might not register when loading is attempted, that's why you get an empty list.
QUESTION
I am a bit confused with how the class loading works in the below scenario. Now here's what I know about class loading.
As per the Tomcat docs. The class loading happens in the following order
- Bootstrap classes of your JVM
- WEB-INF/classes of your web application
- /WEB-INF/lib/*.jar of your web application
- System class loader classes
- Common class loader classes --> This is tomcat's lib dir and my external jar is here
And if it is not a web-app, then the class loading happens in this order
Bootstrap Loader
System Loader
Application Loader
Now, in my case, I have a web application that reads some serialized data by using an external jar. When trying to read the serialized data, the jar throws ClassNotFoundException
. But if I use my own serialization logic without using the jar, then the application works.
This is the erroneous example
...ANSWER
Answered 2021-Jun-21 at 16:28ObjectInputStream#readObject
calls ObjectInputStream#resolveClass
to retrieve objects. The default implementation uses the first loader on the current thread's stack, therefore it uses the common loader in your case. A classloader can find only his own classes and those of its ancestors, so it can not find the classes in your web application.
If you want to deserialize an object in your web application, you need to use the web application's class loader, which is set as context class loader on the current thread. Therefore you need to extend ObjectInputStream
like this:
QUESTION
I am trying to understand how classloader works. I have built a simple test application and running in -verbose:class mode. I have an interface and a class.
Interface
...ANSWER
Answered 2020-Jun-19 at 05:54I don't remember this exactly, but I'm thinking it's because h is "public static final" in an interface. This means the constant is simply redefined internally in the Elephant.class bytecode, if I'm not mistaken, which means Animal is not needed at this point.
QUESTION
I found a custom class loader, which loads classes by child-first principle. And it works fine, but I faced with the following issue. When I try to load classes that use SPI I get the exception:
...ANSWER
Answered 2020-Apr-10 at 12:16So, after 3 days I finally got an answer to my question. And it says that I am stupid :) because in the article at the very end the author provided the example with correct behavior and it works in my case. However, it doesn`t work in my other test with slf4j and logback dependencies. But to my surprise, the code without system class loader works. In the nutshell, I try to use different versions of slf4j and logback.
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Install class-loader
PHP requires the Visual C runtime (CRT). The Microsoft Visual C++ Redistributable for Visual Studio 2019 is suitable for all these PHP versions, see visualstudio.microsoft.com. You MUST download the x86 CRT for PHP x86 builds and the x64 CRT for PHP x64 builds. The CRT installer supports the /quiet and /norestart command-line switches, so you can also script it.
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