Regularly updated, CFR is able to decompile all the modern Java features:
#Java compiler online free#
This free and open-source decompiler is available here: Author: Lee Benfield Here's a list of decompilers presented on this site: class file and pre-process it, so it becomes JDK 1.3 compatible, and then run Jad over it (one of those older, but better decompilers).īut recently, a new wave of decompilers has forayed onto the market: Procyon, CFR, JD, Fernflower, Krakatau, Candle.
The only so-so working solution was to take the. The obsoleteness was typically proved by the fact that they can only decompile JDK 1.3 bytecode. Nonetheless, this quick introduction perhaps would provide clues as to what to look for while getting started with the Java Compiler APIs.Until recently, you needed to use a Java decompiler and all of them were either unstable, obsolete, unfinished, or in the best case all of the above. As should be obvious, there are deeper implications of this API, of which here we only have scratched the surface. The Java Compiler APIs provide programmatic access to the Java Compiler from within the Java Applications. To visit a particular node, we can simply override the corresponding visitorXYZ method. It visits all the child tree nodes and helps to maintain the path to the parent node. It is built around the same patterns as the element scanner and works in a similar fashion. The Java Compiler Tree API adheres to that requirement and closely associates with the package. it is necessary to parse the entire Java source file into an abstract syntax tree especially for the purpose of doing deeper analysis. Both these classes are found in the package. For example, the ElementScanner9 scans according to the source version RELEASE_9 and RELEASE_10, whereas ElementScanner8 scans according to the source version RELEASE_8, respectively. It is built around a visitor pattern to scan program elements with default behavior, as appropriate according to the release of the source version. The element scanners perform analysis across all language elements during the compilation process. This ultimately determines the meaning of the annotation. The logic written inside the process method does the all the tricks about what criteria we opt to set to process the annotation. We begin by extending the AbstractProcessor abstract class which lets us to override the process method. The SupportedAnnotationTypes defines what kind of annotations the annotation processor will process and the SupportedSourceVersion defines the version it supports. ProcessingEnv.getMessager().printMessage( getSystemJavaCompiler() įor(SourceVersion sv:compiler.getSourceVersions()) public Boolean process(Set annotations,įor (Element e : roundEnv.getElementsAnnotatedWith For example, we can easily find out the list of Java source version supported by the compiler installed in your system. This class provides methods to locate tool providers of compilers. The ToolProvider class provides the entry point of the compiler APIs. It also provides a Service Provider Interface (SPI) for structured access to diagnostics and file abstraction for overriding file access. It provides a framework that allow clients to locate and run compilers from their own application code. The javax.tools package provides interfaces and classes to work with the Java compiler and can be invoked from a program during execution. The model, element, and type packages deal with the elements of Java programming language whereas the util package assists in the processing of program elements and types. It enables communication between the annotation processor and annotation processing tools environment. The annotation processing facilitates access to annotation processor which can be thought of as a plug-in to the Java compiler.
#Java compiler online code#
It defines the type and model declaration of the Java programming language and compiler tools that can be invoked from an application code during execution. This module includes the language model and annotation processing, along with compiler APIs. The Java Compiler APIs are part of a Java module called piler.