Develop Reference

Java Class "BCRSAPublicKey" Intermittently Not Found

Context
Using KNIME 4.1.2, Windows 10, x64, JDK 1.8, Java Edit Snippet
I am attempting to use the Java Snippet to read a CSV file, pgp encrypt it using a public key, and save the resulting file to a temporary folder
I have been attempting to use BounceCastle Library v1.65
try {
encryptFile(
"encryptedfile.csv.pgp",
"original.csv",
"/key/pub.asc",
false,
false);
} catch(Exception e) {
out_result = "fail";
}
The challenge is, I get the following error in the console INTERMITTENTLY and I am unclear what I am incorrectly providing to the library / not including. The confounding is because it is intermittent and sometimes yields the properly encrypted file.
Caused by: java.lang.NoClassDefFoundError: org/bouncycastle/jcajce/provider/asymmetric/rsa/BCRSAPublicKey
at org.bouncycastle.jcajce.provider.asymmetric.rsa.KeyFactorySpi.engineGeneratePublic(Unknown Source)
at java.security.KeyFactory.generatePublic(KeyFactory.java:328)
at org.bouncycastle.openpgp.operator.jcajce.JcaPGPKeyConverter.implGeneratePublic(Unknown Source)
at org.bouncycastle.openpgp.operator.jcajce.JcaPGPKeyConverter.getPublicKey(Unknown Source)
at org.bouncycastle.openpgp.operator.jcajce.JcePublicKeyKeyEncryptionMethodGenerator.encryptSessionInfo(Unknown Source)
at org.bouncycastle.openpgp.operator.PublicKeyKeyEncryptionMethodGenerator.generate(Unknown Source)
at org.bouncycastle.openpgp.PGPEncryptedDataGenerator.open(Unknown Source)
at org.bouncycastle.openpgp.PGPEncryptedDataGenerator.open(Unknown Source)
at JSnippet.encryptFile(JSnippet.java:144)
at JSnippet.encryptFile(JSnippet.java:107)
at JSnippet.snippet(JSnippet.java:174)
at org.knime.base.node.jsnippet.JavaSnippetCellFactory.getCells(JavaSnippetCellFactory.java:300)

Running jTSS in Eclipse

I am trying to run the Trusted Computing API JSR321 in Eclipse by following the tutorial provide at Getting Started with JSR321 in Windows 7.
After successfully enabling my TPM (manufacturer: STM & version: 1.2).
I tried to run the code given in the tutorial,
import javax.trustedcomputing.tpm.TPMContext;
public class HellowWorld {
public static void main(String[] args) {
// TODO Auto-generated method stub
try{
TPMContext context = TPMContext.getInstance();
context.connect(null);
//Do somthing cool here
context.close();
}
catch (Exception e){
e.printStackTrace();
}
}
}
I also added the external jar files as Classpaths in eclipse for the IAIK jTSS (jTSS 0.7.1a), they also mentioned that
It is necessary to set the jsr321.tpmcontextimpl property to the classname of your TPMContext implementation.
For example java -cp YourClasspath -Djsr321.tpmcontextimpl=iaik.tc.jsr321.tpm.TPMContextImpl yourjavaapplication.class
So I added the above code by right clicking on the project and going to the Run As -> Run Configuration and in the Arguments tab in the section provided for VM arguments I inserted the following command
-cp C:\Users\workspace\HelloWorld\bin -Djsr321.tpmcontextimpl=iaik.tc.jsr321.tpm.TPMContextImpl HellowWorld
But I am getting the following error:
Exception in thread "main" java.lang.NoClassDefFoundError: javax/trustedcomputing/tpm/TPMContext
at HellowWorld.main(HellowWorld.java:10)
Caused by: java.lang.ClassNotFoundException: javax.trustedcomputing.tpm.TPMContext
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 1 more
I have already added all the mentioned dependencies in Java Build Paths inside Project Properties.
Kindly suggest a solution.
Thanks

Cannot instantiate InitialContext with JBoss server

I'm trying to create a InitialContext so I could ask the JNDI for some enterprise java beans.
The JBoss is running fine, but when I run the java code I get an exception.
I'm running JBoss 7.1
Here is my code:
public class Test {
public static void main(String[] args){
InitialContext ctx=getInitialContext();
Object ref=null;
try {
ref = ctx.lookup("ParamEJB/remote");
} catch (NamingException e) {
System.out.println("Lookup Failed");
e.printStackTrace();
}
Param stub=(Param)PortableRemoteObject.narrow(ref, Param.class);
int times=stub.getTimes();
for(int i=0;i<times;i++)
System.out.println(stub.getMessage());
}
public static InitialContext getInitialContext(){
Hashtable<String,String> h=new Hashtable<String,String>();
h.put("java.naming.factory.initial","org.jnp.interfaces.NamingContextFactory");
h.put("java.naming.provider.url","localhost");
try {
return new InitialContext(h);
} catch (NamingException e) {
System.out.println("Cannot generate InitialContext");
e.printStackTrace();
}
return null;
}
}
And after i start my JBoss server, I try to run the java code and I get this exception:
javax.naming.NoInitialContextException: Cannot instantiate class: org.jnp.interfaces.NamingContextFactory [Root exception is java.lang.ClassNotFoundException: org.jnp.interfaces.NamingContextFactory]
at javax.naming.spi.NamingManager.getInitialContext(Unknown Source)
at javax.naming.InitialContext.getDefaultInitCtx(Unknown Source)
at javax.naming.InitialContext.init(Unknown Source)
at javax.naming.InitialContext.<init>(Unknown Source)
at client.Test.getInitialContext(Test.java:32)
at client.Test.main(Test.java:13)
Caused by: java.lang.ClassNotFoundException: org.jnp.interfaces.NamingContextFactory
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
What might be the problem?

I had the same problem but I found how to fix it. All you have to do is add the jbossall-client.jar library to the clients project, and done!!! You can find the file inside the client folder. e.g jboss-6.1.0.Final_GPT\client I was using Jboss 6.1.0 You can also get help from this link https://community.oracle.com/thread/1157701?start=0
Hope it helps.

The InitialContext properties are not right for the JBoss version that you are using.
With JBoss 7, things have changed considerably when you call a ejb from a remote client.
This link can help you to instantiate correctly the InitialContex object and to determine the JNDI entry name. Also will tell you what are the necessary dependencies that need to be added to the client classpath.

Apache Gora - java.net.MalformedURLException while creating a hbase datastore

I am building a project which uses Gora-hbase as backend .
Hbase is up and running . I am not using maven or ivy .
Also i have specified the following in /conf/gora.properties :
gora.datastore.default=org.apache.gora.hbase.store.HBaseStore
gora.datastore.autocreateschema=true
In my code, i am using the following piece of code to start a datastore :
datastore =
DataStoreFactory.getDataStore(long.class,UserDetails.class,new
Configuration());
I am getting the following exception at the above line :
13/02/04 23:02:26 INFO zookeeper.ClientCnxn: Session establishment complete on server localhost/127.0.0.1:2181, sessionid = 0x13ca8d9ecac000c, negotiated timeout = 40000
org.apache.gora.util.GoraException: java.lang.RuntimeException: java.net.MalformedURLException
at org.apache.gora.store.DataStoreFactory.createDataStore(DataStoreFactory.java:167)
at org.apache.gora.store.DataStoreFactory.getDataStore(DataStoreFactory.java:278)
at com.psl.gora.java.model.TestClass.init(TestClass.java:34)
at com.psl.gora.java.model.TestClass.<init>(TestClass.java:23)
at com.psl.gora.java.model.TestClass.main(TestClass.java:47)
Caused by: java.lang.RuntimeException: java.net.MalformedURLException
at org.apache.gora.hbase.store.HBaseStore.initialize(HBaseStore.java:125)
at org.apache.gora.store.DataStoreFactory.initializeDataStore(DataStoreFactory.java:102)
at org.apache.gora.store.DataStoreFactory.createDataStore(DataStoreFactory.java:161)
... 4 more
Caused by: java.net.MalformedURLException
at java.net.URL.<init>(URL.java:617)
at java.net.URL.<init>(URL.java:480)
at java.net.URL.<init>(URL.java:429)
at org.apache.xerces.impl.XMLEntityManager.setupCurrentEntity(Unknown Source)
at org.apache.xerces.impl.XMLVersionDetector.determineDocVersion(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
at org.jdom.input.SAXBuilder.build(SAXBuilder.java:453)
at org.jdom.input.SAXBuilder.build(SAXBuilder.java:770)
at org.apache.gora.hbase.store.HBaseStore.readMapping(HBaseStore.java:524)
at org.apache.gora.hbase.store.HBaseStore.initialize(HBaseStore.java:111)
... 6 more
Caused by: java.lang.NullPointerException
at java.net.URL.<init>(URL.java:522)
... 19 more
Is there anything I am missing or am not aware of?
Any help or suggestion appreciated.

When this stacktrace is shown, probably is because gora-hbase-mapping.xml is missing.
This question is from months ago, but if other person has the same problem, maybe this would help.
From HBaseStore:524 is being called builder.build(null) and results are like in http://www.eclipse.org/forums/index.php/t/262714/
---- Other possibility ----
Try as key class String.class and check if it works. (Just checking...)

Skype error? Or Eclipse error?

I tried making a simple project for my skype-bot, and it looks like this:
import com.skype.Skype;
import com.skype.SkypeException;
public class SkypeDemo {
public static void main(String[] args) throws SkypeException {
System.out.println(Skype.getVersion());
}
}
But when i started it i get this error:
Exception in thread "main" com.skype.SkypeException: Loading libskype.jnilib failed.
at com.skype.Utils.convertToSkypeException(Unknown Source)
at com.skype.Utils.getProperty(Unknown Source)
at com.skype.Skype.getVersion(Unknown Source)
at SkypeDemo.main(SkypeDemo.java:6)
Caused by: com.skype.connector.LoadLibraryException: Loading libskype.jnilib failed.
at com.skype.connector.ConnectorUtils.loadLibrary(Unknown Source)
at com.skype.connector.osx.SkypeFramework.init(Unknown Source)
at com.skype.connector.osx.OSXConnector.initializeImpl(Unknown Source)
at com.skype.connector.Connector.initialize(Unknown Source)
at com.skype.connector.Connector.connect(Unknown Source)
at com.skype.connector.Connector.assureAttached(Unknown Source)
at com.skype.connector.Connector.execute(Unknown Source)
at com.skype.connector.Connector.execute(Unknown Source)
at com.skype.connector.Connector.execute(Unknown Source)
at com.skype.connector.Connector.execute(Unknown Source)
... 3 more
So how do I fix this error? Keep in mind I have both Skype jars in the build path.

The error is telling you that it cannot load a native library ("libskype.jnilib"). This is (probably) neither Eclipse or Skype's fault.
It is most likely your fault because either the native library is not where it needs to be (or you haven't told Eclipse where to look), or because you have the wrong flavour of native code (DLL, .so or whatever)
(If there was another chained "cause" in the stack trace, it might tell you more ...)
Reference:
This blog post explains how to add a native library to an Eclipse project - http://www.eclipsezone.com/eclipse/forums/t49342.html (In fact, it describes two ways ...)