Develop Reference

Dynamic reports classnotfoundexception

I have a java program that uses dynamic reports fine in netbeans, and even works in exe and jar when I first run it. However, if I share the jar/exe (I've even sent it and re-downloaded it on my own computer), I get an error java.lang.classnotfoundexception: net.sf.jasperreports.engine.jrdatasource. However, I have double checked my jars and I do have this class. What could be the source of this problem then?
Thanks
Edit: full error:
Exception in thread "main" java.lang.NoClassDefFoundError:
net/sf/jasperreports/engine/JRDataSource
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Unknown Source)
at java.lang.Class.privateGetMethodRecursive(Unknown Source)
at java.lang.Class.getMethod0(Unknown Source)
at java.lang.Class.getMethod(Unknown Source)
at sun.launcher.LauncherHelper.validateMainClass(Unknown Source)
at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)
Caused by: java.lang.ClassNotFoundException:
net.sf.jasperreports.engine.JRDataSource
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 7 more

if you get Caused by: java.lang.ClassNotFoundException: inside a jar file then, you need to provide the classpath arguments;
example:
java -cp my.jar -jar ExternalJarFileName.jar
you can also provide all jars use below command, only need to create a directory and put all external jars in to it and use path of directory in to below command:
java -cp my.jar;C:\externalJar\* mainpackage.MainClass

Apache Tomcat home page not coming

I installed Apache server (Tomcat 7.63) on client machine (Window 7 system 32 bit), The Java version used in client machine is (JDK 1.8 update 60)
Problem
Tomcat server is started by running the file (...\bin\Tomcat7.exe). But when I tried to open the home page (http://localhost:8080/) it is not coming on browser and I can see the following exception on Apache log:
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler process
SEVERE: Error reading request, ignored
java.lang.ExceptionInInitializerError
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at sun.nio.cs.AbstractCharsetProvider.lookup(Unknown Source)
at sun.nio.cs.AbstractCharsetProvider.access$000(Unknown Source)
at sun.nio.cs.AbstractCharsetProvider$1.next(Unknown Source)
at sun.nio.cs.AbstractCharsetProvider$1.next(Unknown Source)
at java.nio.charset.Charset.put(Unknown Source)
at java.nio.charset.Charset.access$200(Unknown Source)
at java.nio.charset.Charset$3.run(Unknown Source)
at java.nio.charset.Charset$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.nio.charset.Charset.availableCharsets(Unknown Source)
at org.apache.tomcat.util.buf.B2CConverter.<clinit>(B2CConverter.java:51
)
at org.apache.tomcat.util.buf.ByteChunk.<clinit>(ByteChunk.java:102)
at org.apache.tomcat.util.buf.MessageBytes.<init>(MessageBytes.java:58)
at org.apache.tomcat.util.buf.MessageBytes.<init>(MessageBytes.java:36)
at org.apache.tomcat.util.buf.MessageBytes$MessageBytesFactory.newInstan
ce(MessageBytes.java:685)
at org.apache.tomcat.util.buf.MessageBytes.newInstance(MessageBytes.java
:78)
at org.apache.coyote.Request.<init>(Request.java:83)
at org.apache.coyote.AbstractProcessor.<init>(AbstractProcessor.java:61)
at org.apache.coyote.http11.AbstractHttp11Processor.<init>(AbstractHttp1
1Processor.java:273)
at org.apache.coyote.http11.Http11Processor.<init>(Http11Processor.java:
56)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.creat
eProcessor(Http11Protocol.java:165)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.creat
eProcessor(Http11Protocol.java:103)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(
AbstractProtocol.java:586)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoin
t.java:316)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskTh
read.java:61)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
at sun.nio.cs.CharsetMapping.load(Unknown Source)
at sun.nio.cs.CharsetMapping$1.run(Unknown Source)
at sun.nio.cs.CharsetMapping$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.nio.cs.CharsetMapping.get(Unknown Source)
at sun.nio.cs.ext.SJIS_0213$1.run(Unknown Source)
at sun.nio.cs.ext.SJIS_0213$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.nio.cs.ext.SJIS_0213.<clinit>(Unknown Source)
... 30 more
Exception in thread "http-bio-8085-exec-1" java.lang.NullPointerException
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(
AbstractProtocol.java:731)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoin
t.java:316)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskTh
read.java:61)
at java.lang.Thread.run(Unknown Source)
What is really weird to me that if I start Apache server from Services Management Console from the administrator account: Administrative Tools -> Services , it is working fine and I can see that the home page (http://localhost:8080/) is coming on browser.
Question
Why Apache home page is not coming if we run Apache server using the .exe file (...\bin\Tomcat7.exe) ? Why the home page is coming if the server started using Windows service ? In both cases the same .exe file is execute to run the server, what is the difference between the two cases ?

Tomcat cannot be started by using the exe directly (unless the correct parameters are supplied), you should use one of the included .bat files if you want to do that: startup.bat
Just be sure to define your environment variables, such as JAVA_HOME, and/or JRE_HOME

JUpload issue on jsp page

Im getting:
load: class wjhk.jupload2/JUploadApplet.class not found.
java.lang.ClassNotFoundException: wjhk.jupload2.JUploadApplet.class
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection failed:http://test1/EAMAPP84/data/docuploads/ROADS/NoamTest/wjhk/jupload2/JUploadApplet/class.class
at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
... 9 more
Exception: java.lang.ClassNotFoundException: wjhk.jupload2.JUploadApplet.class
on the java consule.
the applet is called:
<applet
code="wjhk.jupload2/JUploadApplet.class"
codebase="\EAMAPP84\data\docuploads\ROADS\NoamTest"
archive="JUpload.jar"
width="650"
height="400">
<param name="actionURL"
value="\\test1\EAMAPP84\data\docuploads\ROADS\NoamTest">
</applet>
while the jar is sitting in the given directory.
the wierd thing is, when i create a simple html file using this it works, butwhen using it in my jsp page i get this error.
anyone?

The code attribute should point to the fully qualified name of the class (the same as you would use in import statement of a normal Java class).
code="wjhk.jupload2.JUploadApplet"
The exception is by the way also hinting that:
java.lang.ClassNotFoundException: wjhk.jupload2.JUploadApplet.class
(the .class part doesn't belong there at all)
and also here:
java.io.IOException: open HTTP connection failed:http://test1/EAMAPP84
/data/docuploads/ROADS/NoamTest/wjhk/jupload2/JUploadApplet/class.class
(note the /class.class part which is obviously wrong)

code="wjhk.jupload2/JUploadApplet.class"
Should probably be..
code="wjhk.jupload2.JUploadApplet"

How can I run this Applet offline?

I need this applet located here link text (the same in a popup is here: http://tcip.mste.illinois.edu/applet_popup.php?num=2)
I have downloaded (actually mirrored the whole site :D ) all the jars & the js files.
one of the js (tcip.js) describes which applet will be called & from which class located in a particular jar file.
So, how can I execute/run it offline? is it like that I have to include all the jar files in a netbeans project and then run it?
As am using Java and I need this applet for a Power Grid presentation in my college.
One of the lines which I was able to get in page's source was this:
edu.uiuc.TCIP.education.summer06.lessons.lesson4.Lesson4Applet
what does this mean..? is it like all the 5-6 jar files which I have download are run simultaneously.. and then one of the jar file named "lessons" or "lessons_old_naming" is having this structure
edu.uiuc.TCIP.education.summer06.lessons.lesson4.Lesson4Applet
as in this is the package structure..? and Lesson4Applet is what I want to get executed..?
How can I get it for offline viewing/execution..?
would appreciate it..if anyone from you could get it working for me..for offline (locally executed jar) viewing.
console output/error-details:
Java Plug-in 1.6.0_22
Using JRE version 1.6.0_22-b04 Java HotSpot(TM) Client VM
User home directory = C:\Users\~Ultimate~
----------------------------------------------------
c: clear console window
f: finalize objects on finalization queue
g: garbage collect
h: display this help message
l: dump classloader list
m: print memory usage
o: trigger logging
q: hide console
r: reload policy configuration
s: dump system and deployment properties
t: dump thread list
v: dump thread stack
x: clear classloader cache
0-5: set trace level to <n>
----------------------------------------------------
load: class edu.uiuc.TCIP.education.summer06.lessons.lesson2.Lesson2Applet not found.
java.lang.ClassNotFoundException: edu.uiuc.TCIP.education.summer06.lessons.lesson2.Lesson2Applet
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.FileNotFoundException: F:\USB_240910\ht\nw22\nw22\tcip.mste.illinois.edu\edu\uiuc\TCIP\education\summer06\lessons\lesson2\Lesson2Applet.class (The system cannot find the path specified)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(Unknown Source)
at java.io.FileInputStream.<init>(Unknown Source)
at sun.net.www.protocol.file.FileURLConnection.connect(Unknown Source)
at sun.net.www.protocol.file.FileURLConnection.getInputStream(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
... 9 more
Exception: java.lang.ClassNotFoundException: edu.uiuc.TCIP.education.summer06.lessons.lesson2.Lesson2Applet
load: class edu.uiuc.TCIP.education.summer06.lessons.lesson2.Lesson2Applet not found.
java.lang.ClassNotFoundException: edu.uiuc.TCIP.education.summer06.lessons.lesson2.Lesson2Applet
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.FileNotFoundException: F:\USB_240910\ht\nw22\nw22\tcip.mste.illinois.edu\edu\uiuc\TCIP\education\summer06\lessons\lesson2\Lesson2Applet.class (The system cannot find the path specified)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(Unknown Source)
at java.io.FileInputStream.<init>(Unknown Source)
at sun.net.www.protocol.file.FileURLConnection.connect(Unknown Source)
at sun.net.www.protocol.file.FileURLConnection.getInputStream(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
... 9 more
Exception: java.lang.ClassNotFoundException: edu.uiuc.TCIP.education.summer06.lessons.lesson2.Lesson2Applet
load: class edu.uiuc.TCIP.education.summer06.lessons.lesson2.Lesson2Applet not found.
java.lang.ClassNotFoundException: edu.uiuc.TCIP.education.summer06.lessons.lesson2.Lesson2Applet
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.FileNotFoundException: F:\USB_240910\ht\nw22\nw22\tcip.mste.illinois.edu\edu\uiuc\TCIP\education\summer06\lessons\lesson2\Lesson2Applet.class (The system cannot find the path specified)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(Unknown Source)
at java.io.FileInputStream.<init>(Unknown Source)
at sun.net.www.protocol.file.FileURLConnection.connect(Unknown Source)
at sun.net.www.protocol.file.FileURLConnection.getInputStream(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
... 9 more
Exception: java.lang.ClassNotFoundException: edu.uiuc.TCIP.education.summer06.lessons.lesson2.Lesson2Applet
load: class edu.uiuc.TCIP.education.summer06.lessons.lesson2.Lesson2Applet not found.
java.lang.ClassNotFoundException: edu.uiuc.TCIP.education.summer06.lessons.lesson2.Lesson2Applet
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.FileNotFoundException: F:\USB_240910\ht\nw22\nw22\tcip.mste.illinois.edu\edu\uiuc\TCIP\education\summer06\lessons\lesson2\Lesson2Applet.class (The system cannot find the path specified)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(Unknown Source)
at java.io.FileInputStream.<init>(Unknown Source)
at sun.net.www.protocol.file.FileURLConnection.connect(Unknown Source)
at sun.net.www.protocol.file.FileURLConnection.getInputStream(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
... 9 more
Exception: java.lang.ClassNotFoundException: edu.uiuc.TCIP.education.summer06.lessons.lesson2.Lesson2Applet

Delving into the JS that launches that applet suggests the relevant applet element is:
<APPLET name='myApplet' WIDTH = 800 HEIGHT = 600
CODE='edu.uiuc.TCIP.education.summer06.lessons.lesson2.Lesson2Applet'
ARCHIVE='jfreechart-1.0.10.jar , jcommon-1.0.13.jar , jama-1.0.2.jar, lessons_old_naming.jar , psdataobjects.jar, psdisplayobjects.jar, anl_lpsolver.jar , zebLP.jar'>
</APPLET>
If you create an HTML with that applet element and a codebase of http://tcip.mste.illinois.edu/, it should work. Mind you, once the applet loaded in my FF, I got simply a 'black screen' (shrugs).
BTW - do you have permission from the makers of the applet and the site to use their applet?
BTW - I have tested this applet element and seen it work locally!
Later: Now I look at your question more carefully, I realize that I never really answered it correctly, because I missed the 'offline' specifics. My bad!
By adding the codebase attribute, I was 'cheating' by allowing the JRE to reach back to the originating site for all the resources. AFAIU those resources are:
The Jars mentioned in the archive attribute.
The images used by the applet.
This is going to be a little more tricky.
Let us assume you want the HTML to be (poorly) named OFFLINE_applet.html, and you want everything located into the powergrid directory. In that case, the structure would be..
powergrid
OFFLINE_applet.html
jfreechart-1.0.10.jar
jcommon-1.0.13.jar
jama-1.0.2.jar
lessons_old_naming.jar
psdataobjects.jar
psdisplayobjects.jar
anl_lpsolver.jar
zebLP.jar
applet_images
the images found in http://tcip.mste.illinois.edu/applet_images/
Actually, not every image in applet_images is required. This applet only uses about 20 of them AFAIR, but download all of them it and should work.
Of course, remove the 'codebase' attribute, or the JRE will still be trying to reach back to the http://tcip.mste.illinois.edu/ site for the resources!
Test it and get back to me.

Save the result of the php page as html page and open it in any browser. It the applet does not need a server connection then it will work.

java.lang.ClassNotFoundException

I have embedded an applet (jar file)in a html page
Now when I am trying to access the web page , it is giving the following error.
<APPLET CODE="com.xxx.tru.ReadNFCSerialNumber" NAME="Read" ID="Read" MAYSCRIPT alt="Photo Id" ARCHIVE="\test.jar, \ojdbc14.signed.jar, \ojdbc14_g.signed.jar" WIDTH="100%" HEIGHT="100%" HSPACE="1" VSPACE="1">
</APPLET>
load: class com.xxx.tru.ReadNFCSerialNumber not found.
java.lang.ClassNotFoundException: com.xxx.tru.ReadNFCSerialNumber
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection failed:http://localhost/popit/POPit/com/xxx/tru/ReadNFCSerialNumber.class
at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
... 7 more
Exception: java.lang.ClassNotFoundException: com.xxx.tru.ReadNFCSerialNumber
What am i doing wrong??

The web browser is trying to load your class from the URI http://localhost/popit/POPit/com/xxx/tru/ReadNFCSerialNumber.class instead of your jar file. The contents of the ARCHIVE attribute looks suspicious to me. Is it really supposed to be a comma-and-space delimited list? Also, the backslashes in front of the file names look suspicious:
ARCHIVE="\test.jar, \ojdbc14.signed.jar, \ojdbc14_g.signed.jar"
I would suggest you look into fixing the ARCHIVE attribute and then see if the web browser will load the class file form the jar as you want it to do.

the CODEBASE attribute is missing. just a thought.code base