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# JavaCheck `javacheck/`
> **Location**: `javacheck/`
> **Language**: Java
> **Purpose**: Java runtime property detection
> **Latest Version**: 0.0.5-1
---
## Overview
JavaCheck is a minimal Java program that prints system properties. It's used by ProjT Launcher to detect and validate Java installations.
---
## How It Works
```
┌─────────────────┐ ┌─────────────┐ ┌──────────────┐
│ ProjT Launcher │────▶│ JavaCheck │────▶│ stdout │
│ (C++) │ │ (Java) │ │ properties │
└─────────────────┘ └─────────────┘ └──────────────┘
```
### Execution
```bash
java -jar javacheck.jar java.version java.home os.arch
```
### Output
```
java.version=17.0.9
java.home=/usr/lib/jvm/java-17-openjdk
os.arch=amd64
```
---
## Properties Checked
| Property | Description |
|----------|-------------|
| `java.version` | Java version string |
| `java.home` | JRE installation path |
| `os.arch` | System architecture |
| `java.vendor` | JVM vendor |
| `java.vm.name` | JVM implementation |
---
## Exit Codes
| Code | Meaning |
|------|---------|
| 0 | All properties found |
| 1 | One or more properties null |
---
## Usage in Launcher
ProjT Launcher uses JavaCheck to:
1. **Validate Java installations** — Ensure Java is working
2. **Detect version** — Choose correct Java for Minecraft version
3. **Get architecture** — Match 32/64-bit requirements
4. **Auto-detect Java** — Find installed JREs/JDKs
---
## Building
```bash
cd javacheck
javac JavaCheck.java
jar cfe javacheck.jar JavaCheck JavaCheck.class
```
---
## Related Documentation
- [LauncherJava](./launcherjava.md) — Launch component
- [Program Info](./program_info.md) — Application config
|
