org.apache.derby.iapi.services.info

Class JVMInfo

java.lang.Object

org.apache.derby.iapi.services.info.JVMInfo

public abstract class JVMInfo
extends java.lang.Object

This class is used to determine which Java specification Derby will run at. For a useful discussion of how this class is used, please see DERBY-3176.

Field Summary

Fields

Modifier and Type	Field and Description
static int	J2SE_16
static int	J2SE_17
static int	J2SE_18
static int	JDK_ID The JVM's runtime environment.

Constructor Summary

Constructors

Constructor and Description
JVMInfo()

Method Summary

Modifier and Type	Method and Description
static java.lang.String	derbyVMLevel() Return Derby's understanding of the virtual machine's environment.
static boolean	hasJNDI() Determine whether we are running in a constrained environment.
static boolean	isIBMJVM() Check whether this is IBM jvm.
static boolean	isSunJVM() Check whether this is sun jvm.
static void	javaDump() For IBM jvm, this method will dump more diagnostic information to file.
static int	jdbcMajorVersion()
static int	jdbcMinorVersion()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

JDK_ID

public static final int JDK_ID

The JVM's runtime environment.

• 1 - not used was JDK 1.1
• 2 - not used, was for JDK 1.2 and 1.3
• 4 - not used, was for JDK 1.4.0 or 1.4.1
• 5 - not used, was for JDK 1.4.2
• 6 - not used, was for JDK 1.5
• 7 - J2SE_16 - JDK 1.6
• 8 - J2SE_17 - JDK 1.7
• 9 - J2SE_18 - JDK 1.8

J2SE_16

public static final int J2SE_16

See Also:

Constant Field Values

J2SE_17

public static final int J2SE_17

See Also:

Constant Field Values

J2SE_18

public static final int J2SE_18

See Also:

Constant Field Values

Constructor Detail

JVMInfo

public JVMInfo()

Method Detail

jdbcMajorVersion

public static int jdbcMajorVersion()

jdbcMinorVersion

public static int jdbcMinorVersion()

derbyVMLevel

public static java.lang.String derbyVMLevel()

Return Derby's understanding of the virtual machine's environment.

isSunJVM

public static final boolean isSunJVM()

Check whether this is sun jvm.

Returns:

true if it is sun jvm, false if it is not sun jvm

isIBMJVM

public static final boolean isIBMJVM()

Check whether this is IBM jvm.

Returns:

true if it is IBM jvm, false if it is not IBM jvm

javaDump

public static void javaDump()

For IBM jvm, this method will dump more diagnostic information to file. JVM specific code for other vender can be added. DERBY-4856

hasJNDI

public static boolean hasJNDI()

Determine whether we are running in a constrained environment.

Returns:

true if JNDI is available