Elements in the default-web.xml File

checkInterval

0 

The checkInterval is the time in seconds between checks to see if a JSP file needs to be recompiled.

If the development element is false and checkInterval is greater than zero it means the back ground compilations are enabled.

compiler

javac 

Specifies the compiler Ant uses to compile JSP files. See the Ant documentation for more information: Compiles the JSP pages: http://antinstaller.sourceforge.net/manual/manual/ 

compilerSourceVM

Allows source compatibility with the specified JDK release. 

compilerTargetVM

true 

Generates class files for the specified VM version 

classdebuginfo

true 

The JSP page gets compiled with debug information. 

classpath

created dynamically based on the current web application  

classpath is generated dynamically based on the current web application.

development

true 

By default, JSP pages are recompiled since the request. The modifications are specified through the modificationTestInterval parameter. If false, checkInterval is enabled.

dumpSmap

false 

If set to true, dumps SMAP information for JSR 45 debugging to a file. Set to false if suppressSmap is true

enablePooling

true 

Determines whether the tag handler pooling is enabled. 

errorOnUserBeanInvalidClassAttribute

false 

If set to true, issues an error when the value of the class attribute in a useBean action is not a valid bean class.

fork

true 

fork compiles JSP pages with a separate JVM process.

genStrCharArray

false 

If set to true, generates text strings as char arrays, which improves performance in some cases.

httpMethods

ALL METHODS 

Comma separated list of HTTP methods are supported by JSP/Servlet. Wildcard (*) denotes all methods. 

ieClassId

clsid:8AD9C840- 044E-11D1-B3E9- 00805F499D93

Default value is sent to Internet Explorer when using the <jsp:plugin> tags.

initialCapacity

32 

Initial capacity of HashMap mapping JSPs to their corresponding servlets. 

initial-capacity

Same as initialCapacity. If both are specified, initialCapacity takes the precedence

javeEncoding

UTF – 8 

This element does the character encoding for Java ^TM files,

javaCompilerPlugin

The fully qualified class name of the JSP compiler plug-in. 

keepgenerated

true 

By default, the generated Java files are kept in the subdirectory after compilation. 

modificationTestInterval

0 

JSP files can only be modified during the specified time interval mentioned in seconds. By Default, value allows to modify JSP files in development mode without time constraint. 

mappedfile

true 

By default, the static content in a JSP page result in one print statement. 

reload-interval

0 

Specifies the frequency at which JSP files are checked for modifications. The frequency value is in seconds. If the value is 0 JSP pages are checked for modifications. —1 disables the checks for JSP page.

scratchdir

Work directory for the application 

The Java and class files are stored in this directory. 

suppressSmap

false 

If set to true, generation of SMAP information for JSR 45 debugging is suppressed. 

trimSpaces

false 

If set to true, trims white spaces in template text between actions or directives. 

usePrecompiled

false 

If true, JSP files are precompiled and their corresponding servlet classes have been bundled in the web applications's WEB-INF/lib or WEB-INF/classes. When JSP is accessed, it is not compiled and instead precompiled servlet class is used.

use-precompiled

false 

Same as usePrecompiled. If both are specified, usePrecompiled takes the precedence.

minThreads

1 

Minimum number of idle threads in the JSP compiler thread pool. 

maxThreads

20 

Maximum number of threads in the JSP compiler thread pool.