ClassNotFoundException with Netbeans and H2 Database - database

So I followed the tutorial on the H2 Documentation page and used the "Connecting to a Database using JDBC" method of connecting to the database. I First added the h2-*.jar file to the Lib Folder (through Netbeans) and used the following to make the connection to my database I previously created.
Class.forName("org.h2.Driver");
connection = DriverManager.getConnection("jdbc:h2:~/" + DatabaseName);
This turned out to work in the IDE environment, however when I attempted to run the application directly from the jar executable I get the following error:
java.lang.ClassNotFoundException: org.h2.Driver ...
this error occurs at the Class.forName() class loader. So I did a little looking around and found that this was a prominent problem. One solution people use was to extract the class Loader from the current Thread as so:
Thread t = Thread.currentThread();
ClassLoader cl = t.getContextClassLoader();
cl.getClass().getClassLoader();
Class toRun = cl.loadClass("org.h2.Driver");
Unfortunately this seems to still result in the same error, so i'm wondering what i'm doing wrong. Should I be doing something to make sure the Driver is in the class path? I have no I idea how if that's the case.
Thanks!

You need to add the h2-*.jar file to the classpath when running the application, for example using
java -cp h2*.jar -jar yourApp.jar

Related

Java FX JAR File can not find SQL Server Driver

I fought for 8 hours yesterday getting my Java FX (11) Standalone JAR to work at all. I finally did, and now when I run it via java -jar myjar.jar (with path info for fx components), it at least "works" inasmuch as I can see my "own application's" error messages and message boxes lol.
This app needs to connect to SQL Server. It works FINE in IDE (IntelliJ). For JAR, I did not include the SQL Server driver as it is signed. No big deal - figure I'd just deploy it too and put it in the path. However, the JAR file can not "see" the driver (or the class - not sure) when run. Here is the info:
SQL Server driver is mssql-jdbc-8.2.2.jre11.jar
My connection Code is:
connection = DriverManager.getConnection(connectString); and connectString = "jdbc:sqlserver://localhost:1433;database=mydatabase;userName=myuser;password=mypword"
Again - this WORKS FINE in IDE. However, run from jar, it gets "java.sql.SQLException: No suitable driver found for jdbc:sqlserver://localhost:1433;database=mydatabase;userName=myuser;password=mypword"
I have put the mssql-jdbc-8.2.2.jre11.jar into the same directory as the jar. I have included it in the MANIFEST.MF with Class-Path: mssql-jdbc-8.2.2.jre11.jar and also tried it in a "lib" subdirectory from the jar file with Class-Path: /lib. Nothing Works! I just keep getting the "no suitable driver" error. The full manifest file looks like:
Manifest-Version: 1.0
Class-Path: /lib
Main-Class: com.product.Launcher
Here is the full call from command line that actually launches the app: java --module-path C:/Users/KMatson/Documents/JetBrains/openjfx-11.0.2_windows-x64_bin-sdk/javafx-sdk-11.0.2/lib/ --add-modules javafx.controls,javafx.fxml,javafx.graphics -jar myjar.jar This does run the app, but as soon as app tries to connect to SQL, I get the error.
Also tried the old-style Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver") to no avail even thought it should not be necessary, and isn't needed run from IDE.
This is driving me crazy and has taken WAY more time than it should. I'm new to all this, and hope it is something simple I am overlooking or unaware of. Any help MUCH appreciated.
OK - here is the (intermediate) answer that worked for me. Apparently, having the "--module path" declaration in the cmd line was overriding the Class-path in the MANIFEST somehow. Either that or something was - dunno - didn't think i had a "modular" project. I'm not building from Maven, and module-info is not active.
Anyway - I simply put the driver jar in the "module path" I use from cmd, and it worked. I'm now trying to figure out how to make this thing "double clickable" so i don't have to issue from cmd line or use a batch file.

KNIME Command Line Execution - ClassNotFoundException

I'd like to schedule a KNIME workflow. The workflow does its job very good as long as I start it from the KNIME GUI application. When I execute the same workflow via command line, java complains that com.microsoft.sqlserver.jdbc.SQLServerDriver
could not be found (ClassNotFoundException).
I invoke it via:
"D:\Progamme\KNIME\knime.exe" -nosplash -application -consoleLog org.knime.product.KNIME_BATCH_APPLICATION -preferences="absolutepathto\preferences.epf" -workflowDir="absolutepathto\workflow"
Since the error message signals missing content in the java CLASSPATH I also tried to add the parameters
-vmargs -classpath .;"absolutepathto/sqljdbc42.jar"
But still I earn a java slap, pointing to the same error...
I also tried to run the command from within the knime.exe's directory and I also tried to add the JAR file to Preferences -> Java -> Build Path -> Classpath Variable / User Libraries (referenced via the -preference argument). But that had no effect.
Did anybody face the same problems? Maybe with other third party JARs?
It is all about a Database connector that is configured like this:
Does the integrated security maybe force a misleading error?
System spec: KNIME 3.2.2 on Windows Server 2008 R2
Update - extract from preferences file
/configuration/org.eclipse.core.net/org.eclipse.core.net.hasMigrated=true
/configuration/org.eclipse.ui.ide/MAX_RECENT_WORKSPACES=10
/configuration/org.eclipse.ui.ide/RECENT_WORKSPACES=<list of some workspaces>
/configuration/org.eclipse.ui.ide/RECENT_WORKSPACES_PROTOCOL=3
/configuration/org.eclipse.ui.ide/SHOW_RECENT_WORKSPACES=false
/configuration/org.eclipse.ui.ide/SHOW_WORKSPACE_SELECTION_DIALOG=true
Is there maybe a problem due to the fact that it is a shared KNIME instance among several users and the command line execution does not know which workspace has to be chosen? Is the workspace somehow needed and why?
Partial Solution:
I finally managed it but I don't know exactly why it works now. What I did was to load a fresh portable version of KNIME and ran the same commands only changing the executable path to the new portable version. Before that I started the portable version once to set the workspace directory and register the database driver in preferences dialog and .ini file, nothing else, same configuration so far as the shared KNIME instance. What I am really wondering abpout is that from now on the commands are also working with the shared KNIME instance. I really don't know what caused the change that let KNIME find the driver class.
Info
Because I encountered a few more problems within shared environment in KNIME command line mode, that led to undeterministic execution results, I wrote a little .NET library. This gives me more flexibility/control over the workflow execution (which returncodes and error messages occured and so on). You can find it here if you're interested: KnimeNet
I took a very minimal approach:
cd "C:\Program Files\KNIME"
.\knime -nosplash -noexit -consoleLog -reset -application org.knime.product.KNIME_BATCH_APPLICATION -workflowFile="D:\Work\Knime Workflows\Output\CMD_Test.knwf" -preferences="D:\Work\Knime Workflows\Output\CMD_Test.epf"

Grails MS SQLServer 2008 jdbc driver causes problems in tomcat

What is the official way to use the microsoft jdbc driver for mssql in a grails application?
The general opinion that I found through googling is that I only have to drop the jar in the lib directory of the grails app. This works if I do a grails clean and grails compile --refresh-dependencies. But when I deploy on a real server I have two problems.
When redeploying there is this a warning in the logs.
24.05.2013 16:03:03 com.microsoft.sqlserver.jdbc.AuthenticationJNI
WARNUNG: Failed to load the sqljdbc_auth.dll cause : no sqljdbc_auth in java.library.path
I'm not sure if its something to care about since its a warning. But I would like to have my logs clean and I have the dll in the lib directory of the application just as google is saying. Additionally on redeployment there are several messages like this that might relate to the first one:
24.05.2013 16:03:02 org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SCHWERWIEGEND: A web application created a ThreadLocal with key of type [org.codehaus.groovy.runtime.GroovyCategorySupport.MyThreadLocal] (value [org.codehaus.groovy.runtime.GroovyCategorySupport$MyThreadLocal#76fe8d1b]) and a value of type [null] (value [null]) but failed to remove it when the web application was stopped. To prevent a memory leak, the ThreadLocal has been forcibly removed.
And the last thing is that my coworker said, that she thinks the driver should not be installed on a per application basis but directly into tomcat. I actually don't know how to do this, but if I did it, this would cause a problem on the development machine since I don't know how to get grails run-app going without the driver in the applications lib directory.
You can still place the library in the lib folder of your project and just exclude this from the war generation.
You don't need to exclude the jar everytime you build your project, just follow this post tip.
In your Tomcat server the jar will be placed in the shared lib folder instead of each web application.
If after that you still get the warning about sqljdbc_auth.dll you will need to locate this file and add the folder in the Tomcat classpath (or copy to Tomcat lib folder).

Error while creating web service using apache CXF wizard

I am creating a web service through the apache CXF. but while i proceed(before the wsdl gets created), i receive the following error
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/cxf/tools/java2wsdl/JavaToWSDL
This seems like the java2ws.bat file has some error.
The statement in the bat file is
"%JAVA_HOME%\bin\java" -Djava.endorsed.dirs="%CXF_HOME%\lib\endorsed" -cp "%CXF_JAR%;%TOOLS_JAR%;%CLASSPATH%" -Djava.util.logging.config.file="%CXF_HOME%\etc\logging.properties" org.apache.cxf.tools.java2ws.JavaToWS %*
It seems like at Run time,jvm is not able to find the CXF.jar.I added it in the classpath but still the same error
please help me to solve the issue
The problem arises while creating JVM. You can refer : Java Refuses to Start - Could not reserve enough space for object heap
It solved my problem.

NoClassDefFoundError MimeTypeException with PDF extraction

I am getting an exception trying to use update/extract with PDF files
My Set up is:-
Ubuntu Server 11.10
Tomcat 6
Solr 3.5.0.2011.11.22.15.54.38
I can browse to solr/admin OK
I have put all the contrib/extract and apache-solr-cell3.5.0.jar libraries into the tomcat folder webapps/solr/WEB-INF/lib
I am calling extract using:-
curl "http://localhost:8080/solr/update/extract?uprefix=attr_&fmap.content=attr_content&commit=true" -F "file=/path/to/my.pdf"
error is
java.lang.NoClassDefFoundError: org/apache/tika/mime/MimeTypeException
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:383)
at org.apache.solr.core.SolrCore.createInstance(SolrCore.java:425)
at org.apache.solr.core.SolrCore.createRequestHandler(SolrCore.java:461)
at org.apache.solr.core.RequestHandlers$LazyRequestHandlerWrapper.getWrappedHandler(RequestHandlers.java:248)
at org.apache.solr.core.RequestHandlers$LazyRequestHandlerWrapper.handleRequest(RequestHandlers.java:239)
at org.apache.solr.core.SolrCore.execute(SolrCore.java:1372)
Would appreciate any pointers - the only time this error seems to come up elsewhere is with Nutch and cached results.
I have tried sending the mimetype in the querystring and also a *.doc file but got the same error.
According to the error message it is not a MimeTypeException exception you get: The problem is a NoClassDefFoundError, because Solr cannot load the class MimeTypeException.
Normally this class is present in tika-core.jar.
Make sure you actually have that file and also check if you have a lib statement in your solrconfig.xml pointing to the right directory.
This was due to the basic error of copying the necessary tika libraries (to tomcat6/webapps/solr/WEB-INF/lib) but leaving ownership of the jar files as ROOT instead of chown-ing them to TOMCAT6. After setting the right permission and restarting Tomcat it started working OK
Found the solution of this problem, I was using SolrJ to update my pdf indexing.
after deploy solr to tomcat, I didn't include the following libraries into the tomcat/webapp
and I get all the lazy loading problem, etc etc
I even try to get apache tika...
until I do this...
shutdown tomcat
\apache-solr-3.5.0\contrib\extraction
copy the libraries above to below
\apache-tomcat-7.0.26\webapps\solr\WEB-INF\lib
startup tomcat
cheers

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