IBM User Guide for Java V7 on Windows > Reference > Command-line options

System property command-line options

Use the system property command-line options to set up your system.

-D<name>=<value>

Sets a system property.

• -Dcom.ibm.cacheLatestUserDefinedLoader
  This system property enables caching of the Latest User Defined Class Loader (LUDCL), which can improve performance when a serialized object is de-serialized.
• -Dcom.ibm.dbgmalloc
  This option provides memory allocation diagnostic information for class library native code.
• -Dcom.ibm.enableClassCaching
  Setting this property to true enables caching of the Latest User Defined Class Loader (LUDCL).
• -Dcom.ibm.jsse2.renegotiate
  If your Java application uses JSSE for secure communication, you can disable TLS renegotiation by installing APAR IZ65239.
• -Dcom.ibm.lang.management.verbose
  Enables verbose information from java.lang.management operations to be written to the output channel during VM operation.
• -Dcom.ibm.IgnoreMalformedInput
  Invalid UTF8 or malformed byte sequences are replaced with the standard unicode replacement character \uFFFD.
• -Dcom.ibm.mappedByteBufferForce
  Setting this value to true forces data to be committed to disk during system failure.
• -Dcom.ibm.rational.mvfs.checking
  Use this property to improve the performance of Multi Version File System (MVFS) file systems.
• -Dcom.ibm.tools.attach.enable
  Enable the Attach API for this application.
• -Dcom.ibm.zipfile.closeinputstreams
  The Java.util.zip.ZipFile class allows you to create InputStreams on files held in a compressed archive.
• -Dfile.encoding
  Use this property to define the file encoding that is required.
• -Dibm.jvm.bootclasspath
  The value of this property is used as an additional search path.
• -Dibm.stream.nio
  This option addresses the ordering of IO and NIO converters.
• -Dil8n.vs
  This system property enables awareness of Unicode Ideographic Variation Sequence (IVS) to draw characters, except in peered components.
• -Djava.compiler
  Disables the Java compiler by setting to NONE.
• -Djavax.xml.namespace.QName.useCompatibleHashCodeAlgorithm
  Use this property to turn off an enhanced hashing algorithm for javax.xml.namespace.QName.hashCode().
• -Djdk.map.althashing.threshold
  This system property controls the use of an enhanced hashing algorithm for hashed maps.
• -Dsun.awt.keepWorkingSetOnMinimize
  The -Dsun.awt.keepWorkingSetOnMinimize=true system property stops the JVM trimming an application when it is minimized.
• -Dsun.net.client.defaultConnectTimeout
  Specifies the default value for the connect timeout for the protocol handlers used by the java.net.URLConnection class.
• -Dsun.net.client.defaultReadTimeout
  Specifies the default value for the read timeout for the protocol handlers used by the java.net.URLConnection class when reading from an input stream when a connection is established to a resource.
• -Dsun.nio.MaxDirectMemorySize
  Limits the native memory size for nio Direct Byte Buffer objects to the value specified.
• -Dsun.rmi.transport.tcp.connectionPool
  Enables thread pooling for the RMI ConnectionHandlers in the TCP transport layer implementation.
• -Dswing.useSystemFontSettings
  This option addresses compatibility problems for Swing programs.

Parent: Command-line options

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