1. sax is an event based parser and raise and event, while
dom is not
2. sax is forward only where as dom can acess both was
forward as well as backwards.
3. sax parses the file as it reads where as the dom loads
the file into memory to parse the file.
4. Sax does not have memory constraints where as the dom
has momory constraints as xml file is loaded into the
momory to parse the file.
5. sax is read only , dom is read and write both.
6. if you have to parse and use the content only once ,
consider using sax if the xml file and content are used
extensively then consider using dom
Both SAX and DOM are used to parse the XML document. Both
has advantages and disadvantages and can be used in our
programming depending on the situation
SAX:
1. Parses node by node
2. Doesnt store the XML in memory
3. We cant insert or delete a node
4. Top to bottom traversing
DOM
1. Stores the entire XML document into memory before processing
2. Occupies more memory
3. We can insert or delete nodes
4. Traverse in any direction.
If we need to find a node and doesnt need to insert or
delete we can go with SAX itself otherwise DOM provided we
have more memory.
It really nice Explanation by penchala the more about XML
SAX :
---
SAX Parser is the one which is developed to run the java
programs especially.
DOM:
---
DOM is developed by w3c consortium so that it is an open
standard.
In DOM the xml file is arranged as a tree and backward and
forward search is possible for searching the tags and
evaluating the data which it holds.
It depends upon the application and ease of data
accessiblity.
If we want to extract the data from a xml file once we
have to move to SAX which is one time top to bottom read
approach and if we want ot randomly pick the data in an xml
file then the tree reperesentation of DOM model is to be
put into use. Thats all !
sax is simple api for xml
it read the first xml data and get outputed backward is not
possible,
dom is doccument object model
through dom we can create a xml data as a tree and it is
loaded in memory so we can easily access the data
DOM
1. Tree of nodes
2. Memory: Occupies more memory, preffered for small XML
documents
3. Slower at runtime
4. Stored as objects
5. Programmatically easy
6. Ease of navigation
SAX
1. Sequence of events
2. Doesn't use any memory preferred for large documents
3. Faster at runtime
4. Objects are to be created
5. Need to write code for creating objects
6. Backward navigation is not possible as it sequentially
processes the document
Hi frnds iam new to struts wen iam running helloworld
application using struts iam getting the error as belwo
kindly any one can solve it plzz .....thanks in
advance.........
Nov 18, 2009 9:27:46 PM
org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING:
[SetPropertiesRule]{Server/Service/Engine/Host/Context}
Setting property 'source' to
'org.eclipse.jst.jee.server:StrutsExample1' did not find a
matching property.
Nov 18, 2009 9:27:46 PM
org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING:
[SetPropertiesRule]{Server/Service/Engine/Host/Context}
Setting property 'source' to
'org.eclipse.jst.jee.server:Struts1' did not find a matching
property.
Nov 18, 2009 9:27:46 PM
org.apache.catalina.core.AprLifecycleListener init
INFO: The APR based Apache Tomcat Native library which
allows optimal performance in production environments was
not found on the java.library.path: C:\Program
Files\Java\jre6\bin;.;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\sys
tem32;C:\WINDOWS;C:/Program
Files/Java/jre6/bin/client;C:/Program
Files/Java/jre6/bin;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOW
S\System32\Wbem;C:\Program Files\Java\jdk1.5.0_18\bin;
Nov 18, 2009 9:27:46 PM
org.apache.coyote.http11.Http11Protocol init
INFO: Initializing Coyote HTTP/1.1 on http-8081
Nov 18, 2009 9:27:46 PM org.apache.catalina.startup.Catalina
load
INFO: Initialization processed in 678 ms
Nov 18, 2009 9:27:46 PM
org.apache.catalina.core.StandardService start
INFO: Starting service Catalina
Nov 18, 2009 9:27:46 PM
org.apache.catalina.core.StandardEngine start
INFO: Starting Servlet Engine: Apache Tomcat/6.0.20
Nov 18, 2009 9:27:46 PM
org.apache.catalina.core.ApplicationContext log
INFO: Marking servlet action as unavailable
Nov 18, 2009 9:27:46 PM
org.apache.catalina.core.ApplicationContext log
SEVERE: Error loading WebappClassLoader
delegate: false
repositories:
/WEB-INF/classes/
----------> Parent Classloader:
org.apache.catalina.loader.StandardClassLoader@ca2dce
org.apache.struts.action.ActionServlet
java.lang.ClassNotFoundException:
org.apache.struts.action.ActionServlet
at
org.apache.catalina.loader.WebappClassLoader.loadClass(Webap
pClassLoader.java:1387)
at
org.apache.catalina.loader.WebappClassLoader.loadClass(Webap
pClassLoader.java:1233)
at
org.apache.catalina.core.StandardWrapper.loadServlet(Standar
dWrapper.java:1095)
at
org.apache.catalina.core.StandardWrapper.load(StandardWrappe
r.java:993)
at
org.apache.catalina.core.StandardContext.loadOnStartup(Stand
ardContext.java:4149)
at
org.apache.catalina.core.StandardContext.start(StandardConte
xt.java:4458)
at
org.apache.catalina.core.ContainerBase.start(ContainerBase.j
ava:1045)
at
org.apache.catalina.core.StandardHost.start(StandardHost.jav
a:722)
at
org.apache.catalina.core.ContainerBase.start(ContainerBase.j
ava:1045)
at
org.apache.catalina.core.StandardEngine.start(StandardEngine
.java:443)
at
org.apache.catalina.core.StandardService.start(StandardServi
ce.java:516)
at
org.apache.catalina.core.StandardServer.start(StandardServer
.java:710)
at
org.apache.catalina.startup.Catalina.start(Catalina.java:583
)
at
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown
Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at
org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:2
88)
at
org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:41
3)
Nov 18, 2009 9:27:46 PM
org.apache.catalina.core.StandardContext loadOnStartup
SEVERE: Servlet /Struts1 threw load() exception
java.lang.ClassNotFoundException:
org.apache.struts.action.ActionServlet
at
org.apache.catalina.loader.WebappClassLoader.loadClass(Webap
pClassLoader.java:1387)
at
org.apache.catalina.loader.WebappClassLoader.loadClass(Webap
pClassLoader.java:1233)
at
org.apache.catalina.core.StandardWrapper.loadServlet(Standar
dWrapper.java:1095)
at
org.apache.catalina.core.StandardWrapper.load(StandardWrappe
r.java:993)
at
org.apache.catalina.core.StandardContext.loadOnStartup(Stand
ardContext.java:4149)
at
org.apache.catalina.core.StandardContext.start(StandardConte
xt.java:4458)
at
org.apache.catalina.core.ContainerBase.start(ContainerBase.j
ava:1045)
at
org.apache.catalina.core.StandardHost.start(StandardHost.jav
a:722)
at
org.apache.catalina.core.ContainerBase.start(ContainerBase.j
ava:1045)
at
org.apache.catalina.core.StandardEngine.start(StandardEngine
.java:443)
at
org.apache.catalina.core.StandardService.start(StandardServi
ce.java:516)
at
org.apache.catalina.core.StandardServer.start(StandardServer
.java:710)
at
org.apache.catalina.startup.Catalina.start(Catalina.java:583
)
at
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown
Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at
org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:2
88)
at
org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:41
3)
Nov 18, 2009 9:27:46 PM
org.apache.coyote.http11.Http11Protocol start
INFO: Starting Coyote HTTP/1.1 on http-8081
Nov 18, 2009 9:27:46 PM org.apache.jk.common.ChannelSocket
init
INFO: JK: ajp13 listening on /0.0.0.0:8009
Nov 18, 2009 9:27:46 PM org.apache.jk.server.JkMain start
INFO: Jk running ID=0 time=0/31 config=null
Nov 18, 2009 9:27:46 PM org.apache.catalina.startup.Catalina
start
INFO: Server startup in 616 ms
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