Develop Reference

Null Pointer exception while running Jmeter test in Java

Following is my simple code to run jmeter test plan in Java8.
import org.apache.jmeter.control.LoopController;
import org.apache.jmeter.engine.StandardJMeterEngine;
import org.apache.jmeter.protocol.http.sampler.HTTPSampler;
import org.apache.jmeter.testelement.TestPlan;
import org.apache.jmeter.threads.ThreadGroup;
import org.apache.jmeter.util.JMeterUtils;
import org.apache.jorphan.collections.HashTree;
public class JmxSuite {
public static void main(String[] args){
StandardJMeterEngine jmeter = new StandardJMeterEngine();
JMeterUtils.setJMeterHome("C:\\PLACES\\apache-jmeter-2.11");
HashTree testPlanTree = new HashTree();
HTTPSampler httpSampler = new HTTPSampler();
httpSampler.setDomain("exapmle.com");
httpSampler.setPort(80);
httpSampler.setPath("/");
httpSampler.setMethod("GET");
LoopController loopController = new LoopController();
loopController.setLoops(1);
loopController.addTestElement(httpSampler);
loopController.setFirst(true);
loopController.initialize();
ThreadGroup threadGroup = new ThreadGroup();
threadGroup.setNumThreads(1);
threadGroup.setRampUp(1);
threadGroup.setSamplerController(loopController);
TestPlan testPlan = new TestPlan("RKSV Jmeter Testing");
testPlanTree.add("testPlan", testPlan);
testPlanTree.add("loopController", loopController);
testPlanTree.add("threadGroup", threadGroup);
testPlanTree.add("httpSampler", httpSampler);
jmeter.configure(testPlanTree);
jmeter.run();
}
}
But I am keep getting the following error while running it.
INFO 2016-04-07 15:40:44.060 [jmeter.e] (): Listeners will be started after enabling running version
INFO 2016-04-07 15:40:44.079 [jmeter.e] (): To revert to the earlier behaviour, define jmeterengine.startlistenerslater=false
INFO 2016-04-07 15:40:44.108 [jmeter.p] (): No response parsers defined: text/html only will be scanned for embedded resources
INFO 2016-04-07 15:40:44.115 [jmeter.p] (): Maximum connection retries = 10
INFO 2016-04-07 15:40:44.121 [jmeter.e] (): Running the test!
INFO 2016-04-07 15:40:44.141 [jmeter.s] (): List of sample_variables: []
INFO 2016-04-07 15:40:44.141 [jmeter.s] (): List of sample_variables: []
Exception in thread "main" java.lang.NullPointerException
at org.apache.jmeter.util.JMeterUtils.setProperty(JMeterUtils.java:885)
at org.apache.jmeter.threads.JMeterContextService.startTest(JMeterContextService.java:92)
at org.apache.jmeter.engine.StandardJMeterEngine.run(StandardJMeterEngine.java:313)
at JmxSuite.main(JmxSuite.java:48)
And following is my pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>Places</groupId>
<artifactId>Places</artifactId>
<version>0.0.1-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>org.apache.jmeter</groupId>
<artifactId>ApacheJMeter_java</artifactId>
<version>2.11</version>
</dependency>
<dependency>
<groupId>org.apache.jmeter</groupId>
<artifactId>ApacheJMeter_http</artifactId>
<version>2.11</version>
</dependency>
</dependencies>
</project>
What could be the possible reason for it?
I have used code from 4th topic from this 5 ways to run jmeter

You're missing few lines from the article, double check your code, to wit:
JMeterUtils.loadJMeterProperties("C:\\PLACES\\apache-jmeter-2.11\\bin\\jmeter.properties");
JMeterUtils.initLogging();
JMeterUtils.initLocale();
Also there is an example project jmeter-from-code which can be used as a reference or skeleton.
Also consider using latest version of JMeter, for the moment it's Apache JMeter 2.13

The error occurs because the internal Properties-object of JMeterUtils is null at this point. Add the following line to your code to initalize this object:
JMeterUtils.loadJMeterProperties("/path/to/your/jmeter/bin/jmeter.properties");
EDIT: Instead of doing it all manually you should call
JMeterUtils.initializeProperties("/path/to/your/jmeter/bin/jmeter.properties");
which is the correct way and does all the initalizing of logging and locale internally.

Openstack4j: Error 400 authenticate() got an unexpected keyword argument 'username'

using openstack4j, the OpenStack SDK for Java, I have an error when I try to authenticate.
OSClient os = OSFactory.builder().endpoint("http://enpoint:5000/v2.0/")
.credentials("***", "***").tenantName("****").authenticate();
The error is:
400 authenticate() got an unexpected keyword argument 'username'
The library is included using maven as decumented here, using this dependency;
<dependency>
<groupId>org.pacesys</groupId>
<artifactId>openstack4j</artifactId>
<version>2.0.0</version>
<classifier>withdeps</classifier>
</dependency>

java.lang.LinkageError on Websphere while trying to load HttpUriRequest

I'm using CUPS4J for my project, which depends on http-client, http-core, and slf4j.
To resolve dependencies we use Maven, and I have defined dependencies as follows:
<dependency>
<groupId>cups4j</groupId>
<artifactId>cups4j</artifactId>
<version>0.6.4</version>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.0.3</version>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpcore</artifactId>
<version>4.1</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.7</version>
</dependency>
The cups4j dependency is on our ArtiFactory server (I couldn't find it online).
Everything works like a charm if I create a sample main method to print some document and launch it as a java application.
When I publish my classes to the Websphere server and call that method from a webpage, it generates a java.lang.LinkageError.
This is the relevant part of the stacktrace:
Caused by: java.lang.LinkageError: loader constraint violation: loader "org/eclipse/osgi/internal/baseadaptor/DefaultClassLoader#208c132" previously initiated loading for a different type with name "org/apache/http/client/methods/HttpUriRequest" defined by loader "com/ibm/ws/classloader/CompoundClassLoader#1e0f797"
at java.lang.ClassLoader.defineClassImpl(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:260)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.defineClass(DefaultClassLoader.java:188)
at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.defineClass(ClasspathManager.java:580)
at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findClassImpl(ClasspathManager.java:550)
at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClassImpl(ClasspathManager.java:481)
at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass_LockClassName(ClasspathManager.java:460)
at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:447)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:216)
at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:393)
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:469)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:422)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:410)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
at java.lang.ClassLoader.loadClass(ClassLoader.java:612)
at org.apache.http.impl.client.AbstractHttpClient.determineTarget(AbstractHttpClient.java:584)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:708)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:700)
at org.cups4j.operations.IppOperation.sendRequest(IppOperation.java:207)
at org.cups4j.operations.IppOperation.request(IppOperation.java:76)
at org.cups4j.CupsPrinter.print(CupsPrinter.java:113)
at it.dropcomp.tasks.print.PrinterService.printPDF(PrinterService.java:160)
This is the method that prints the PDF (Inside it.dropcomp.tasks.print.PrinterService):
public void printPDF() throws RemoteServiceException {
/*
* generatedPDF is defined as File, and it's properly initialized
* before calling this method.
*/
if(generatedPDF == null) {
throw new RemoteServiceException("You must generate a file first!");
}
try {
CupsPrinter selectedPrinter = new CupsPrinter(
new URL(Constants.PRINTER_FULL_URL),
Constants.PRINTER_NAME, true
);
InputStream is = new FileInputStream(generatedPDF);
PrintJob pj = new PrintJob.Builder(is).build();
selectedPrinter.print(pj); //this is line 160
} catch (Exception e) {
LOG.error("Exception", e);
throw new RemoteServiceException(e);
}
}
It seems that HttpUriRequest already exists and makes conflict with the one provided by the httpclient library from Apache, but if I try removing that dependency from pom.xml, I get a NoClassDefFoundException for that class.
If it matters, my IDE is Eclipse Luna.
How can I solve this exception?

WebSphere uses also httpclient library which may conflict with one you are providing.
Try to create isolated shared library in admin console via Environment > Shared Libraries. Put http-*, slf4j and cups4j jars there and associate that shared library with your application.

Error creating JClouds SwiftApi: Provider org.jclouds.openstack.keystone.v2_0.KeystoneApiMetadata could not be instantiated

I have some code for connecting to a JClouds swift storage container which works fine in its own test area, but once I integrate into my project, I get an error:
Exception in thread "main" java.util.ServiceConfigurationError:
org.jclouds.apis.ApiMetadata: Provider
org.jclouds.openstack.keystone.v2_0.KeystoneApiMetadata could not be
instantiated: java.lang.IllegalStateException:
java.lang.reflect.InvocationTargetException
This is the code which fails on the ContextBuilder line:
private SwiftApi swiftApi;
public JCloudsConnector(String username, String password, String endpoint) {
String provider = "openstack-swift";
Properties overrides = new Properties();
overrides.setProperty("jclouds.mpu.parallel.degree", "" + Runtime.getRuntime().availableProcessors());
swiftApi = ContextBuilder.newBuilder(provider)
.endpoint(endpoint)
.credentials(username, password)
.overrides(overrides)
.buildApi(SwiftApi.class);
}
I am using the same dependencies (JClouds version 1.7.3) so I can't understand what the problem might be since both are run in the same environment.

Thanks to Ignasi Barrera, I was able to sort this by adding an entry for Guava 15.0 in my maven POM file:
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>15.0</version>
</dependency>

ElasticSearch: xerial.snappy error FAILED_TO_LOAD_NATIVE_LIBRARY

I'm trying running ElasticSearch client and getting xerial.snappy error FAILED_TO_LOAD_NATIVE_LIBRARY.
I'm using elastic search v. 0.20.5:
<dependency>
<groupId>org.elasticsearch</groupId>
<artifactId>elasticsearch</artifactId>
<version>0.20.5</version>
</dependency>
and also added snappy v.1.0.4.1 into my dependency(but it did not help either):
<dependency>
<groupId>org.xerial.snappy</groupId>
<artifactId>snappy-java</artifactId>
<version>1.0.4.1</version>
</dependency>
here is the error I'm getting (my app continues to run, but I suspect compression lib is not in use)
INFO Log4jESLogger.internalInfo - [Human Top II] loaded [], sites []
DEBUG Log4jESLogger.internalDebug - using [UnsafeChunkDecoder] decoder
DEBUG Log4jESLogger.internalDebug - failed to load xerial snappy-java
org.xerial.snappy.SnappyError: [FAILED_TO_LOAD_NATIVE_LIBRARY] null
at org.xerial.snappy.SnappyLoader.load(SnappyLoader.java:229)
at org.xerial.snappy.Snappy.<clinit>(Snappy.java:44)
at org.elasticsearch.common.compress.snappy.xerial.XerialSnappy.<clinit>(XerialSnappy.java:42)
at org.elasticsearch.common.compress.CompressorFactory.<clinit>(CompressorFactory.java:58)
at org.elasticsearch.client.transport.TransportClient.<init>(TransportClient.java:161)
at org.elasticsearch.client.transport.TransportClient.<init>(TransportClient.java:109)
My code that generates this issue:
public static void main(String[] args)
{
// Error happens during client creation...
Client client = new TransportClient().addTransportAddress(new InetSocketTransportAddress("localhost", 9300));
try
{
SearchResponse res = client.prepareSearch().execute().actionGet();
SearchHits hits = res.getHits();
}
finally
{
client.close();
}
}
Can anyone shed some light into this issue? How to make snappy to load native lib? I'm currently on Win7-64, but want to be running on AWS(centOS,RH,etc)