'\" t.\" Copyright (c) 1994, 2013, Oracle and/or its affiliates. All rights reserved..\" DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER..\".\" This code is free software; you can redistribute it and/or modify it.\" under the terms of the GNU General Public License version 2 only, as.\" published by the Free Software Foundation..\".\" This code is distributed in the hope that it will be useful, but WITHOUT.\" ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or.\" FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License.\" version 2 for more details (a copy is included in the LICENSE file that.\" accompanied this code)..\".\" You should have received a copy of the GNU General Public License version.\" 2 along with this work; if not, write to the Free Software Foundation,.\" Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA..\".\" Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA.\" or visit www.oracle.com if you need additional information or have any.\" questions..\".\" Arch: generic.\" Software: JDK 8.\" Date: 21 November 2013.\" SectDesc: Basic Tools.\" Title: javah.1.\".if n .pl 99999.TH javah 1 "21 November 2013" "JDK 8" "Basic Tools".\" -----------------------------------------------------------------.\" * Define some portability stuff.\" -----------------------------------------------------------------.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~.\" http://bugs.debian.org/507673.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~.ie \n(.g .ds Aq \(aq.el .ds Aq '.\" -----------------------------------------------------------------.\" * set default formatting.\" -----------------------------------------------------------------.\" disable hyphenation.nh.\" disable justification (adjust text to left margin only).ad l.\" -----------------------------------------------------------------.\" * MAIN CONTENT STARTS HERE *.\" -----------------------------------------------------------------.SH NAME javah \- Generates C header and source files from a Java class\&..SH SYNOPSIS .sp .nf \fBjavah\fR [ \fIoptions\fR ] f\fIully\-qualified\-class\-name \&.\&.\&.\fR.fi .sp .TP \fIoptions\fRThe command-line options\&. See Options\&..TP \fIfully-qualified-class-name\fRThe fully qualified location of the classes to be converted to C header and source files\&..SH DESCRIPTION The \f3javah\fR 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 \f3\&.h\fR file contains a \f3struct\fR definition with a layout that parallels the layout of the corresponding class\&. The fields in the \f3struct\fR correspond to instance variables in the class\&..PPThe 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 \f3javah\fR 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\&..PPBy default the \f3javah\fR command creates a header file for each class listed on the command line and puts the files in the current directory\&. Use the \f3-stubs\fR option to create source files\&. Use the \f3-o\fR option to concatenate the results for all listed classes into a single file\&..PPThe Java Native Interface (JNI) does not require header information or stub files\&. The \f3javah\fR command can still be used to generate native method function prototypes needed for JNI-style native methods\&. The \f3javah\fR command produces JNI-style output by default and places the result in the \f3\&.h\fR file\&..SH OPTIONS .TP-o \fIoutputfile\fR.brConcatenates the resulting header or source files for all the classes listed on the command line into an output file\&. Only one of \f3-o\fR or \f3-d\fR can be used\&..TP-d \fIdirectory\fR.brSets the directory where the \f3javah\fR command saves the header files or the stub files\&. Only one of \f3-d\fR or \f3-o\fR can be used\&..TP-stubs.brCauses the \f3javah\fR command to generate C declarations from the Java object file\&..TP-verbose.brIndicates verbose output and causes the \f3javah\fR command to print a message to \f3stdout\fR about the status of the generated files\&..TP-help.brPrints a help message for \f3javah\fR usage\&..TP-version.brPrints \f3javah\fR command release information\&..TP-jni.brCauses the \f3javah\fR command to create an output file containing JNI-style native method function prototypes\&. This is the default output; use of \f3-jni\fR is optional\&..TP-classpath \fIpath\fR.brSpecifies the path the \f3javah\fR command uses to look up classes\&. Overrides the default or the \f3CLASSPATH\fR environment variable when it is set\&. Directories are separated by colons on Oracle Solaris and semicolons on Windows\&. The general format for path is:\fIOracle Solaris\fR:\&.:\fIyour-path\fRExample: \f3\&.:/home/avh/classes:/usr/local/java/classes\fR\fIWindows\fR:\&.;\fIyour-path\fRExample: \f3\&.;C:\eusers\edac\eclasses;C:\etools\ejava\eclasses\fRAs 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 \f3\&.jar\fR or \f3\&.JAR\fR\&.For example, if directory \f3mydir\fR contains \f3a\&.jar\fR and \f3b\&.JAR\fR, then the class path element \f3mydir/*\fR is expanded to a \f3A\fR\f3\&.jar:b\&.JAR\fR, 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 \f3CLASSPATH\fR 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 \f3System\&.getenv("CLASSPATH")\fR\&..TP-bootclasspath \fIpath\fR.brSpecifies the path from which to load bootstrap classes\&. By default, the bootstrap classes are the classes that implement the core Java platform located in \f3jre\elib\ert\&.jar\fR and several other JAR files\&..TP-old.brSpecifies that old JDK 1\&.0-style header files should be generated\&..TP-force.brSpecifies that output files should always be written\&..TP-J\fIoption\fR.brPasses \f3option\fR to the Java Virtual Machine, where \f3option\fR is one of the options described on the reference page for the Java application launcher\&. For example, \f3-J-Xms48m\fR sets the startup memory to 48 MB\&. See java(1)\&..SH SEE\ ALSO .TP 0.2i \(bujavah(1).TP 0.2i \(bujava(1).TP 0.2i \(bujdb(1).TP 0.2i \(bujavap(1).TP 0.2i \(bujavadoc(1).RE.br'pl 8.5i'bp