JavaVirtualMachineDetector (Atlassian Bamboo 9.6.1 API)

java.lang.Object
- com.atlassian.bamboo.utils.JavaVirtualMachineDetector

```
public class JavaVirtualMachineDetector
extends Object
```
Based on comment from Vincent Massol on the forums: http://www.pols.co.uk/forums/viewtopic.php?id=26

Constructor Summary

Constructors
Constructor Description

JavaVirtualMachineDetector(boolean isRunningOnOsx)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`containsJavac(File givenDirectory)`
`@Nullable String`	`detectExternalJdkVersion(File givenDirectory)`
`String`	`detectJavaHome(String systemJavaHome)`	Used to detects if the default JAVA_HOME is running on a JRE and not a JDK (so that the tools.jar is missing and build's cannot compile).

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - JavaVirtualMachineDetector
```
public JavaVirtualMachineDetector(boolean isRunningOnOsx)
```
- Method Detail
  - detectJavaHome
```
public String detectJavaHome(String systemJavaHome)
```
    Used to detects if the default JAVA_HOME is running on a JRE and not a JDK (so that the tools.jar is missing and build's cannot compile).
    The strategy is:
    
    If running on OSX, return the JAVA_HOME as no need for tools.jar on the mac
    
    First loot to see if we can find the tools.jar in ${java.home}/lib/tools.jar. If found then you've got your dir.
    
    Otherwise look for tools.jar in ${java.home}/../lib/tools.jar. if found then you've got your dir.
    
    If not, return false, user has installed a JRA and not a JDK
    Parameters:
    
    systemJavaHome - What the system thinks the JAVA_HOME is - may be a JRE or a JVM!
    
    Returns:
    
    The JAVA_HOME adjusted to ensure we're running on JDK and not the JDK's JRE!
    
    Throws:
    
    IllegalStateException - if we are running only on a JRE as we not be able to build any builds by default!
  - containsJavac
```
public boolean containsJavac(File givenDirectory)
```
  - detectExternalJdkVersion
```
@Nullable
public @Nullable String detectExternalJdkVersion(File givenDirectory)
```