Java™ Platform
Standard Ed. 6


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


Interface Summary
Diagnostic<S> Interface for diagnostics from tools.
DiagnosticListener<S> Interface for receiving diagnostics from tools.
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
Tool Common interface for tools that can be invoked from a program.

Class Summary
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
Diagnostic.Kind Kinds of diagnostics, for example, error or warning.
JavaFileObject.Kind Kinds of JavaFileObjects.
StandardLocation Standard locations of file objects.

Package Description

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/ This file would contain the single line:


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();


Java™ Platform
Standard Ed. 6

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For further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

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