GWT (GWT Javadoc)

java.lang.Object
- com.google.gwt.core.client.GWT

```
public final class GWT
extends java.lang.Object
```
Supports core functionality that in some cases requires direct support from the compiler and runtime systems such as runtime type information and deferred binding.

Nested Class Summary

Nested Classes
Modifier and Type	Class and Description
`static interface`	`GWT.UncaughtExceptionHandler` This interface is used to catch exceptions at the "top level" just before they escape to the browser.

Field Summary

Fields
Modifier and Type	Field and Description
`static java.lang.String`	`HOSTED_MODE_PERMUTATION_STRONG_NAME` This constant is used by `getPermutationStrongName()` when running in Development Mode.

Constructor Summary

Constructors
Constructor and Description

GWT()

Constructors
Constructor and Description
`GWT()`

Method Summary

All Methods Static Methods Concrete Methods Deprecated Methods
Modifier and Type	Method and Description
`static <T> T`	`create(java.lang.Class<?> classLiteral)` Instantiates a class via deferred binding.
`static void`	`debugger()` Emits a JavaScript "debugger" statement on the line that called this method.
`static java.lang.String`	`getHostPageBaseURL()` Gets the URL prefix of the hosting page, useful for prepending to relative paths of resources which may be relative to the host page.
`static java.lang.String`	`getModuleBaseForStaticFiles()` Gets the URL prefix that should be prepended to URLs that point to static files generated by the GWT compiler, such as files in the module's public path.
`static java.lang.String`	`getModuleBaseURL()` Gets the URL prefix that should be prepended to URLs that are intended to be module-relative, such as RPC entry points.
`static java.lang.String`	`getModuleName()` Gets the name of the running module.
`static java.lang.String`	`getPermutationStrongName()` Returns the permutation's strong name.
`static java.lang.String`	`getTypeName(java.lang.Object o)` Deprecated. Use `Object.getClass()`, `Class.getName()`
`static GWT.UncaughtExceptionHandler`	`getUncaughtExceptionHandler()` Returns the currently active uncaughtExceptionHandler.
`static java.lang.String`	`getUniqueThreadId()` Returns the empty string when running in Production Mode, but returns a unique string for each thread in Development Mode (for example, different windows accessing the dev mode server will each have a unique id, and hitting refresh without restarting dev mode will result in a new unique id for a particular window.
`static java.lang.String`	`getVersion()`
`static boolean`	`isClient()` Returns `true` when running inside the normal GWT environment, either in Development Mode or Production Mode.
`static boolean`	`isProdMode()` Returns `true` when running in production mode.
`static boolean`	`isScript()` Determines whether or not the running program is script or bytecode.
`static void`	`log(java.lang.String message)` Logs a message to the development shell logger in Development Mode, or to the console in Super Dev Mode.
`static void`	`log(java.lang.String message, java.lang.Throwable e)` Logs a message to the development shell logger in Development Mode, or to the console in Super Dev Mode.
`static void`	`reportUncaughtException(java.lang.Throwable e)` Reports an exception caught at the "top level" to a handler set via `setUncaughtExceptionHandler(UncaughtExceptionHandler)`.
`static void`	`runAsync(java.lang.Class<?> name, RunAsyncCallback callback)` The same as `runAsync(RunAsyncCallback)`, except with an extra parameter to provide a name for the call.
`static void`	`runAsync(RunAsyncCallback callback)` Run the specified callback once the necessary code for it has been loaded.
`(package private) static void`	`setBridge(GWTBridge bridge)` Called via reflection in Development Mode; do not ever call this method in Production Mode.
`static void`	`setUncaughtExceptionHandler(GWT.UncaughtExceptionHandler handler)` Sets a custom uncaught exception handler.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - HOSTED_MODE_PERMUTATION_STRONG_NAME
```
public static final java.lang.String HOSTED_MODE_PERMUTATION_STRONG_NAME
```
    This constant is used by getPermutationStrongName() when running in Development Mode.
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - GWT
```
public GWT()
```
- Method Detail
  - create
```
public static <T> T create(java.lang.Class<?> classLiteral)
```
    Instantiates a class via deferred binding.
    The argument to create(Class) must be a class literal because the Production Mode compiler must be able to statically determine the requested type at compile-time. This can be tricky because using a Class variable may appear to work correctly in Development Mode.
    
    Parameters:
    
    classLiteral - a class literal specifying the base class to be instantiated
    
    Returns:
    
    the new instance, which must be cast to the requested class
  - getHostPageBaseURL
```
public static java.lang.String getHostPageBaseURL()
```
    Gets the URL prefix of the hosting page, useful for prepending to relative paths of resources which may be relative to the host page. Typically, you should use getModuleBaseURL() unless you have a specific reason to load a resource relative to the host page.
    
    Returns:
    
    if non-empty, the base URL is guaranteed to end with a slash
  - getModuleBaseForStaticFiles
```
public static java.lang.String getModuleBaseForStaticFiles()
```
    Gets the URL prefix that should be prepended to URLs that point to static files generated by the GWT compiler, such as files in the module's public path.
    Normally this will be the same value as getModuleBaseURL(), but may be different when a GWT app is configured to get its static resources from a different server.
    
    Returns:
    
    if non-empty, the base URL is guaranteed to end with a slash
  - getModuleBaseURL
```
public static java.lang.String getModuleBaseURL()
```
    Gets the URL prefix that should be prepended to URLs that are intended to be module-relative, such as RPC entry points.
    If the URL points to an output file of the GWT compiler (such as a file in the public path), use getModuleBaseForStaticFiles() instead.
    
    Returns:
    
    if non-empty, the base URL is guaranteed to end with a slash
  - getModuleName
```
public static java.lang.String getModuleName()
```
    Gets the name of the running module.
  - getPermutationStrongName
```
public static java.lang.String getPermutationStrongName()
```
    Returns the permutation's strong name. This can be used to distinguish between different permutations of the same module. In Development Mode, this method will return "HostedMode".
  - getTypeName
```
@Deprecated
public static java.lang.String getTypeName(java.lang.Object o)
```
    Deprecated. Use Object.getClass(), Class.getName()
  - getUncaughtExceptionHandler
```
public static GWT.UncaughtExceptionHandler getUncaughtExceptionHandler()
```
    Returns the currently active uncaughtExceptionHandler.
    
    Returns:
    
    the currently active handler, or null if no handler is active.
    
    See Also:
    
    reportUncaughtException(Throwable)
  - reportUncaughtException
```
public static void reportUncaughtException(java.lang.Throwable e)
```
    Reports an exception caught at the "top level" to a handler set via setUncaughtExceptionHandler(UncaughtExceptionHandler). This is used in places where the browser calls into user code such as event callbacks, timers, and RPC.
    If no UncaughtExceptionHandler is set, the exception is reported to browser. Browsers usually log these exceptions to the JavaScript console.
  - getUniqueThreadId
```
public static java.lang.String getUniqueThreadId()
```
    Returns the empty string when running in Production Mode, but returns a unique string for each thread in Development Mode (for example, different windows accessing the dev mode server will each have a unique id, and hitting refresh without restarting dev mode will result in a new unique id for a particular window. TODO(unnurg): Remove this function once Dev Mode rewriting classes are in gwt-dev.
  - getVersion
```
public static java.lang.String getVersion()
```
  - isClient
```
public static boolean isClient()
```
    Returns true when running inside the normal GWT environment, either in Development Mode or Production Mode. Returns false if this code is running in a plain JVM. This might happen when running shared code on the server, or during the bootstrap sequence of a GWTTestCase test.
  - isProdMode
```
public static boolean isProdMode()
```
    Returns true when running in production mode. Returns false when running either in development mode, or when running in a plain JVM.
  - isScript
```
public static boolean isScript()
```
    Determines whether or not the running program is script or bytecode.
  - log
```
public static void log(java.lang.String message)
```
    Logs a message to the development shell logger in Development Mode, or to the console in Super Dev Mode. Calls are optimized out in Production Mode.
  - log
```
public static void log(java.lang.String message,
                       java.lang.Throwable e)
```
    Logs a message to the development shell logger in Development Mode, or to the console in Super Dev Mode. Calls are optimized out in Production Mode.
  - debugger
```
public static void debugger()
```
    Emits a JavaScript "debugger" statement on the line that called this method. If the user has the browser's debugger open, the debugger will stop when the GWT application executes that line. There is no effect in Dev Mode or in server-side code.
  - runAsync
```
public static void runAsync(java.lang.Class<?> name,
                            RunAsyncCallback callback)
```
    The same as runAsync(RunAsyncCallback), except with an extra parameter to provide a name for the call. The name parameter should be supplied with a class literal. If two GWT.runAsync calls use the same class literal, the codesplitter will put the corresponding code in the same code fragment.
  - runAsync
```
public static void runAsync(RunAsyncCallback callback)
```
    Run the specified callback once the necessary code for it has been loaded.
  - setUncaughtExceptionHandler
```
public static void setUncaughtExceptionHandler(GWT.UncaughtExceptionHandler handler)
```
    Sets a custom uncaught exception handler. See getUncaughtExceptionHandler() for details.
    
    Parameters:
    
    handler - the handler that should be called when an exception is about to escape to the browser, or null to clear the handler and allow exceptions to escape.
  - setBridge
```
static void setBridge(GWTBridge bridge)
```
    Called via reflection in Development Mode; do not ever call this method in Production Mode.

Class GWT

Nested Class Summary

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

HOSTED_MODE_PERMUTATION_STRONG_NAME

Constructor Detail

GWT

Method Detail

create

getHostPageBaseURL

getModuleBaseForStaticFiles

getModuleBaseURL

getModuleName

getPermutationStrongName

getTypeName

getUncaughtExceptionHandler

reportUncaughtException

getUniqueThreadId

getVersion

isClient

isProdMode

isScript

log

log

debugger

runAsync

runAsync

setUncaughtExceptionHandler

setBridge