# Class Constants

java.lang.Object
org.apache.jasper.Constants

public class Constants extends Object
Some constants and other global data that are used by the compiler and the runtime.

Author:
  Anil K. Vijendran, Harish Prabandham, Shawn Bayern, Mark Roth

- ## Field Summary

  Fields
  Modifier and Type
  Field
  Description
  `static final String`
  `CATALINA_HOME_PROP`
  Name of the system property containing the tomcat product installation path
  `static final int`
  `DEFAULT_BUFFER_SIZE`
  Default size of the JSP buffer.
  `static final int`
  `DEFAULT_TAG_BUFFER_SIZE`
  Default size for the tag buffers.
  `static final boolean`
  `IS_SECURITY_ENABLED`
  Has security been turned on?
  `static final String`
  `JSP_FACTORY_POOL_SIZE_INIT_PARAM`
  Name of the ServletContext init-param that determines the JSP factory pool size.
  `static final int`
  `MAX_POOL_SIZE`
  Default tag handler pool size.
  `static final String`
  `SPEC_VERSION`
  `static final List<String>`
  `STANDARD_IMPORTS`
  These classes/packages are automatically imported by the generated code.
  `static final String`
  `XML_BLOCK_EXTERNAL_INIT_PARAM`
  Name of the ServletContext init-param that determines if the XML parsers will block the resolution of external entities.
  `static final String`
  `XML_VALIDATION_TLD_INIT_PARAM`
  Name of the ServletContext init-param that determines if the XML parsers used for *.tld files will be validating or not.

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `Constants()`

- ## Method Summary

  ### Methods inherited from class java.lang.Object

  `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- ## Field Details

  - ### SPEC_VERSION

    public static final String SPEC_VERSION
    See Also:
      - Constant Field Values

  - ### STANDARD_IMPORTS

    public static final List<String> STANDARD_IMPORTS
    These classes/packages are automatically imported by the generated code.

  - ### DEFAULT_BUFFER_SIZE

    public static final int DEFAULT_BUFFER_SIZE
    Default size of the JSP buffer.
    See Also:
      - Constant Field Values

  - ### DEFAULT_TAG_BUFFER_SIZE

    public static final int DEFAULT_TAG_BUFFER_SIZE
    Default size for the tag buffers.
    See Also:
      - Constant Field Values

  - ### MAX_POOL_SIZE

    public static final int MAX_POOL_SIZE
    Default tag handler pool size.
    See Also:
      - Constant Field Values

  - ### IS_SECURITY_ENABLED

    public static final boolean IS_SECURITY_ENABLED
    Has security been turned on?

  - ### CATALINA_HOME_PROP

    public static final String CATALINA_HOME_PROP
    Name of the system property containing the tomcat product installation path
    See Also:
      - Constant Field Values

  - ### XML_VALIDATION_TLD_INIT_PARAM

    public static final String XML_VALIDATION_TLD_INIT_PARAM
    Name of the ServletContext init-param that determines if the XML parsers used for *.tld files will be validating or not.

    This must be kept in sync with org.apache.catalina.Globals

    See Also:
      - Constant Field Values

  - ### XML_BLOCK_EXTERNAL_INIT_PARAM

    public static final String XML_BLOCK_EXTERNAL_INIT_PARAM
    Name of the ServletContext init-param that determines if the XML parsers will block the resolution of external entities.

    This must be kept in sync with org.apache.catalina.Globals

    See Also:
      - Constant Field Values

  - ### JSP_FACTORY_POOL_SIZE_INIT_PARAM

    public static final String JSP_FACTORY_POOL_SIZE_INIT_PARAM
    Name of the ServletContext init-param that determines the JSP factory pool size. Set the value to a positive integer to enable it. The default value is `8` per thread.
    See Also:
      - Constant Field Values

- ## Constructor Details

  - ### Constants

    public Constants()