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Develop iOS Android app in java, Cross platform java virtual machine , the minimal jvm .
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DeepWiki miniJVM Documentation
Build iOS and Android apps in Java with a cross-platform, lightweight Java Virtual Machine. Run the same Java code on mobile and desktop with small binaries and a low memory footprint.
miniJVM on the web, built by Starcommander. Source Web demo
xgui package.j2c module, which converts miniJVM Java source to C and builds native apps for desktop and mobile.Write Java code once and run it on iOS, Android, macOS, Windows, and Linux. The required JARs are not prebuilt, so build them first. Preferred IDEs: Eclipse, NetBeans, or JetBrains IntelliJ IDEA.
Run /binary/build_jar.sh or /binary/build_jar.bat to generate JARs. Alternatively:
/minijvm/java, then copy the output to /mobile/assets/resfiles/minijvm_rt.jar/mobile/java/glfm_gui, then copy the output to /mobile/assets/resfiles/glfm_gui.jar/mobile/java/ExApp, then copy the output to /mobile/assets/resfiles/ExApp.jarIn Xcode, open /mobile/iosapp; configure your developer account in Signing & Capabilities; build and install to a device; then verify the app before running it (Settings -> General -> Device Management -> {developer account} -> Verify App -> Trust).
In Android Studio, open /mobile/androidapp and build/install to an Android device.
AppManager starts and runs:
Run /binary/build_jar.sh or /binary/build_jar.bat to generate JARs. Alternatively:
/binary/lib/minijvm_rt.jar/binary/libex/glfw_gui.jar/binary/libex/minijvm_test.jar/binary/{platform}/apps/ExApp.jarRun /binary/build_mac_linux.sh, /binary/build_wini686.bat, or /binary/build_winx64.bat to generate binaries. Alternatively:
/desktop/glfw_gui/c with CMake/minijvm/c with CMakeRun the test script: /binary/{platform}/test.sh or test.bat.
Most Java IDEs support remote debugging. The IDE connects to miniJVM's debug port over TCP and starts a debugging session. miniJVM provides two options: enable debugging, and suspend on startup (wait for the IDE to attach before executing bytecode). Configure both options before initializing the VM.
These options are defined in jvm.h:
struct _MiniJVM {
...
s32 jdwp_enable; // 0: disable Java debug, 1: enable Java debug and disable JIT
s32 jdwp_suspend_on_start;
...
};
Enable miniJVM debug mode.
Desktop: Run mini_jvm with -Xdebug, add parameter if needed -Xjdwp:transport=dt_socket,server=y,suspend=n,address=5005, or set it in source before building.
/minijvm/c/main.c: jvm->jdwp_enable = 1;
iOS/Android: set it in source before building.
/mobile/c/glfmapp/main.c: jvm->jdwp_enable = 1;
For device debugging, check the device IP address in Settings -> Wi-Fi -> (i).
Run the VM with JARs, for example:
mini_jvm.exe -Xdebug -bootclasspath ../lib/minijvm_rt.jar -cp ../libex/glfw_gui.jar org.mini.glfw.GlfwMain
Open a project in your IDE, for example: /mobile/java/ExApp
IntelliJ IDEA: Run -> Edit Configurations -> + Remote; Transport: Socket; Debugger mode: Attach; host/port of your mini_jvm, for example 127.0.0.1:5005 or 192.168.0.32:5005.
Eclipse: configure similarly.
NetBeans: Debug -> Attach Debugger; Connector: SocketAttach; host/port of your mini_jvm, for example localhost:5005; Timeout: 10000.
Set breakpoints, pause the VM, and inspect variables.
Use the built-in profiling page to monitor method execution cost in real time. The following methods also apply to all platforms, including iOS and Android devices or emulators.
Enable profiling in jvm.h:
#define _JVM_DEBUG_METHOD_PROFILE 1
Rebuild miniJVM.
Run miniJVM, then open Settings -> Developer Options -> Enable LAN Web Server.
Your browser opens automatically at http://localhost:18088/.
On this web page:
Copy C sources from /minijvm/c into your project, and copy the built minijvm_rt.jar into your project's resource folder.
#include "jvm/jvm.h"
int main(int argc, char **argv) {
char *bootclasspath = "../../binary/lib/minijvm_rt.jar";
char *classpath = "../../binary/libex/minijvm_test.jar;./";
char *main_name = "test.Foo3";
s32 ret = 1;
MiniJVM *jvm = jvm_create();
if (jvm != NULL) {
jvm->jdwp_enable = 0; // set to 1 to enable Java remote debugging
jvm->jdwp_suspend_on_start = 0;
jvm->max_heap_size = 25 * 1024 * 1024;
ret = jvm_init(jvm, bootclasspath, classpath);
if (ret) {
printf("[ERROR] minijvm init error.\n");
} else {
ret = call_main(jvm, main_name, NULL);
}
jvm_destroy(jvm);
}
return ret;
}
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