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java.lang.Objectorg.apache.tools.ant.util.JavaEnvUtils
public final class JavaEnvUtils
A set of helper methods related to locating executables or checking conditions of a given Java installation.
| Field Summary | |
|---|---|
| static java.lang.String | JAVA_1_0Version constant for Java 1.0 | 
| static java.lang.String | JAVA_1_1Version constant for Java 1.1 | 
| static java.lang.String | JAVA_1_2Version constant for Java 1.2 | 
| static java.lang.String | JAVA_1_3Version constant for Java 1.3 | 
| static java.lang.String | JAVA_1_4Version constant for Java 1.4 | 
| static java.lang.String | JAVA_1_5Version constant for Java 1.5 | 
| static java.lang.String | JAVA_1_6Version constant for Java 1.6 | 
| static java.lang.String | JAVA_1_7Version constant for Java 1.7 | 
| static java.lang.String | JAVA_1_8Version constant for Java 1.8 | 
| static java.lang.String | JAVA_1_9Version constant for Java 1.9 | 
| static int | VERSION_1_0Number Version constant for Java 1.0 | 
| static int | VERSION_1_1Number Version constant for Java 1.1 | 
| static int | VERSION_1_2Number Version constant for Java 1.2 | 
| static int | VERSION_1_3Number Version constant for Java 1.3 | 
| static int | VERSION_1_4Number Version constant for Java 1.4 | 
| static int | VERSION_1_5Number Version constant for Java 1.5 | 
| static int | VERSION_1_6Number Version constant for Java 1.6 | 
| static int | VERSION_1_7Number Version constant for Java 1.7 | 
| static int | VERSION_1_8Number Version constant for Java 1.8 | 
| static int | VERSION_1_9Number Version constant for Java 1.9 | 
| Method Summary | |
|---|---|
| static java.io.File | createVmsJavaOptionFile(java.lang.String[] cmd)Writes the command into a temporary DCL script and returns the corresponding File object. | 
| static java.lang.String | getJavaHome()Return the value of ${java.home} | 
| static java.lang.String | getJavaVersion()Returns the version of Java this class is running under. | 
| static int | getJavaVersionNumber()Returns the version of Java this class is running under. | 
| static java.lang.String | getJdkExecutable(java.lang.String command)Finds an executable that is part of a JDK installation based on the java.home system property. | 
| static java.lang.String | getJreExecutable(java.lang.String command)Finds an executable that is part of a JRE installation based on the java.home system property. | 
| static java.util.Vector<java.lang.String> | getJrePackages()get a vector of strings of packages built into that platforms runtime jar(s) | 
| static java.util.Vector<java.lang.String> | getJrePackageTestCases()Testing helper method; kept here for unification of changes. | 
| static boolean | isApacheHarmony()Checks whether the current VM is Apache Harmony. | 
| static boolean | isAtLeastJavaVersion(java.lang.String version)Compares the current Java version to the passed in String - assumes the argument is one of the constants defined in this class. | 
| static boolean | isClasspathBased()Checks whether the current Java VM is GNU Classpath | 
| static boolean | isGij()Checks whether the current Java VM is the GNU interpreter gij or we are running in a gcj precompiled binary. | 
| static boolean | isJavaVersion(java.lang.String version)Compares the current Java version to the passed in String - assumes the argument is one of the constants defined in this class. | 
| static boolean | isKaffe()Checks whether the current Java VM is Kaffe. | 
| Methods inherited from class java.lang.Object | 
|---|
| clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait | 
| Field Detail | 
|---|
public static final java.lang.String JAVA_1_0
public static final int VERSION_1_0
public static final java.lang.String JAVA_1_1
public static final int VERSION_1_1
public static final java.lang.String JAVA_1_2
public static final int VERSION_1_2
public static final java.lang.String JAVA_1_3
public static final int VERSION_1_3
public static final java.lang.String JAVA_1_4
public static final int VERSION_1_4
public static final java.lang.String JAVA_1_5
public static final int VERSION_1_5
public static final java.lang.String JAVA_1_6
public static final int VERSION_1_6
public static final java.lang.String JAVA_1_7
public static final int VERSION_1_7
public static final java.lang.String JAVA_1_8
public static final int VERSION_1_8
public static final java.lang.String JAVA_1_9
public static final int VERSION_1_9
| Method Detail | 
|---|
public static java.lang.String getJavaVersion()
public static int getJavaVersionNumber()
public static boolean isJavaVersion(java.lang.String version)
JAVA_1_0 through
 JAVA_1_3 need no longer be tested for.
version - the version to check against the current version.
public static boolean isAtLeastJavaVersion(java.lang.String version)
JAVA_1_0 through
 JAVA_1_3 need no longer be tested for.
version - the version to check against the current version.
public static boolean isKaffe()
public static boolean isClasspathBased()
public static boolean isGij()
public static boolean isApacheHarmony()
public static java.lang.String getJreExecutable(java.lang.String command)
java, keytool,
 policytool, orbd, rmid,
 rmiregistry, servertool and
 tnameserv are JRE executables on Sun based
 JRE's.
You typically find them in JAVA_HOME/jre/bin if
 JAVA_HOME points to your JDK installation.  JDK
 < 1.2 has them in the same directory as the JDK
 executables.
command - the java executable to find.
public static java.lang.String getJdkExecutable(java.lang.String command)
You typically find them in JAVA_HOME/bin if
 JAVA_HOME points to your JDK installation.
command - the java executable to find.
public static java.util.Vector<java.lang.String> getJrePackageTestCases()
public static java.util.Vector<java.lang.String> getJrePackages()
public static java.io.File createVmsJavaOptionFile(java.lang.String[] cmd)
                                            throws java.io.IOException
cmd - the command.
java.io.IOException - if there is an error writing to the file.public static java.lang.String getJavaHome()
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