javah - Online Linux Manual PageSection : 1
Updated : 21 November 2013
Source : JDK 8
Note : Basic Tools
NAMEjavah − Generates C header and source files from a Java class​.
SYNOPSISjavah [ options ] fully−qualified−class−name ​.​.​.options  The command-line options​. See Options​. fully-qualified-class-name  The fully qualified location of the classes to be converted to C header and source files​.
DESCRIPTIONThe javah command generates C header and source files that are needed to implement native methods​. The generated header and source files are used by C programs to reference an object​'s instance variables from native source code​. The ​.h file contains a struct definition with a layout that parallels the layout of the corresponding class​. The fields in the struct correspond to instance variables in the class​. The name of the header file and the structure declared within it are derived from the name of the class​. When the class passed to the javah command is inside a package, the package name is added to the beginning of both the header file name and the structure name​. Underscores (_) are used as name delimiters​. By default the javah command creates a header file for each class listed on the command line and puts the files in the current directory​. Use the -stubs option to create source files​. Use the -o option to concatenate the results for all listed classes into a single file​. The Java Native Interface (JNI) does not require header information or stub files​. The javah command can still be used to generate native method function prototypes needed for JNI-style native methods​. The javah command produces JNI-style output by default and places the result in the ​.h file​.
OPTIONS-o outputfile  
Concatenates the resulting header or source files for all the classes listed on the command line into an output file​. Only one of -o or -d can be used​. -d directory  
Sets the directory where the javah command saves the header files or the stub files​. Only one of -d or -o can be used​. -stubs  
Causes the javah command to generate C declarations from the Java object file​. -verbose  
Indicates verbose output and causes the javah command to print a message to stdout about the status of the generated files​. -help  
Prints a help message for javah usage​. -version  
Prints javah command release information​. -jni  
Causes the javah command to create an output file containing JNI-style native method function prototypes​. This is the default output; use of -jni is optional​. -classpath path  
Specifies the path the javah command uses to look up classes​. Overrides the default or the CLASSPATH environment variable when it is set​. Directories are separated by colons on Oracle Solaris and semicolons on Windows​. The general format for path is: Oracle Solaris: ​.:your-path Example: ​.:/home/avh/classes:/usr/local/java/classes Windows: ​.;your-path Example: ​.;C:\users\dac\classes;C:\tools\java\classes As a special convenience, a class path element that contains a base name of * is considered equivalent to specifying a list of all the files in the directory with the extension ​.jar or ​.JAR​. For example, if directory mydir contains a​.jar and b​.JAR, then the class path element mydir/* is expanded to a A​.jar:b​.JAR, except that the order of jar files is unspecified​. All JAR files in the specified directory, including hidden ones, are included in the list​. A class path entry that consists of * expands to a list of all the JAR files in the current directory​. The CLASSPATH environment variable, where defined, is similarly expanded​. Any class path wild card expansion occurs before the Java Virtual Machine (JVM) is started​. A Java program will never see unexpanded wild cards except by querying the environment​. For example, by calling System​.getenv("CLASSPATH")​. -bootclasspath path  
Specifies the path from which to load bootstrap classes​. By default, the bootstrap classes are the classes that implement the core Java platform located in jre\lib\rt​.jar and several other JAR files​. -old  
Specifies that old JDK 1​.0-style header files should be generated​. -force  
Specifies that output files should always be written​. -Joption  
Passes option to the Java Virtual Machine, where option is one of the options described on the reference page for the Java application launcher​. For example, -J-Xms48m sets the startup memory to 48 MB​. See java(1)​.
SEE ALSO•  javah(1) •  java(1) •  jdb(1) •  javap(1) •  javadoc(1)
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