Module java.compiler

# Package javax.tools

Provides interfaces for tools which can be invoked from a program, for example, compilers.

These interfaces and classes are required as part of the Java™ Platform, Standard Edition (Java SE), but there is no requirement to provide any tools implementing them.

Unless explicitly allowed, all methods in this package might throw a NullPointerException if given a `null` argument or if given a list or collection containing `null` elements. Similarly, no method may return `null` unless explicitly allowed.

This package is the home of the Java programming language compiler framework. This framework allows clients of the framework to locate and run compilers from programs. The framework also provides Service Provider Interfaces (SPI) for structured access to diagnostics (DiagnosticListener) as well as a file abstraction for overriding file access (JavaFileManager and JavaFileObject). See JavaCompiler for more details on using the SPI.

There is no requirement for a compiler at runtime. However, if a default compiler is provided, it can be located using the ToolProvider, for example:

`JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();`

It is possible to provide alternative compilers or tools through the service provider mechanism.

For example, if `com.vendor.VendorJavaCompiler` is a provider of the `JavaCompiler` tool then its jar file would contain the file `META-INF/services/javax.tools.JavaCompiler`. This file would contain the single line:

`com.vendor.VendorJavaCompiler`

If the jar file is on the class path, VendorJavaCompiler can be located using code like this:

`JavaCompiler compiler = ServiceLoader.load(JavaCompiler.class).iterator().next();`

Since:
  1.6

- Interface Summary
  Interface | Description
  --- | ---
  Diagnostic<S> | Interface for diagnostics from tools.
  DiagnosticListener<S> | Interface for receiving diagnostics from tools.
  DocumentationTool | Interface to invoke Java™ programming language documentation tools from programs.
  DocumentationTool.DocumentationTask | Interface representing a future for a documentation task.
  FileObject | File abstraction for tools.
  JavaCompiler | Interface to invoke Java™ programming language compilers from programs.
  JavaCompiler.CompilationTask | Interface representing a future for a compilation task.
  JavaFileManager | File manager for tools operating on Java™ programming language source and class files.
  JavaFileManager.Location | Interface for locations of file objects.
  JavaFileObject | File abstraction for tools operating on Java™ programming language source and class files.
  OptionChecker | Interface for recognizing options.
  StandardJavaFileManager | File manager based on java.io.File and java.nio.file.Path.
  StandardJavaFileManager.PathFactory | Factory to create `Path` objects from strings.
  Tool | Common interface for tools that can be invoked from a program.

- Class Summary
  Class | Description
  --- | ---
  DiagnosticCollector<S> | Provides an easy way to collect diagnostics in a list.
  ForwardingFileObject<F extends FileObject> | Forwards calls to a given file object.
  ForwardingJavaFileManager<M extends JavaFileManager> | Forwards calls to a given file manager.
  ForwardingJavaFileObject<F extends JavaFileObject> | Forwards calls to a given file object.
  SimpleJavaFileObject | Provides simple implementations for most methods in JavaFileObject.
  ToolProvider | Provides methods for locating tool providers, for example, providers of compilers.

- Enum Summary
  Enum | Description
  --- | ---
  Diagnostic.Kind | Kinds of diagnostics, for example, error or warning.
  DocumentationTool.Location | Locations specific to `DocumentationTool`.
  JavaFileObject.Kind | Kinds of JavaFileObjects.
  StandardLocation | Standard locations of file objects.