I'm working on a DB project and this class instantiation code below seems to be failing. I can't seem to figure out why. I've made sure to run mongod and start MongoDB. Does anyone have any tips on how to resolve this?
public DatabaseInterface() {
this.mongoClient = new MongoClient("127.0.0.1", 27017); ## This line
this.database = mongoClient.getDatabase("dbmsProjectDB");
this.gson = new Gson();
}
Exception in thread "main" java.lang.NoClassDefFoundError: com/mongodb/operation/ReadOperation
at backend.DatabaseInterface.<init>(DatabaseInterface.java:54)
at backend.main.main(main.java:8)
Caused by: java.lang.ClassNotFoundException: com.mongodb.operation.ReadOperation
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:606)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:168)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
... 2 more
use MongoClients.create(uri) instead
String uri = "mongodb://localhost";
MongoClient mongoClient = MongoClients.create(uri);
MongoDatabase database = mongoClient.getDatabase("dbmsProjectDB");
The message tells you that he is not able to find the class com.mongodb.operation.ReadOperation. This means that this class is no longer available in this location.
Upgrade the version of your MongoDb Java Driver to the 4.X.X versions.
Beginning from those versions, the path of the ReadOperation class has changed to another location : com.mongodb.internal.operation.ReadOperation
Related
I am trying to export customized values metrics of my Java application to Prometheus. I have read that it could be done with Push Gateway, following an example I use the next method:
static void executeBatchJob() throws Exception {
CollectorRegistry registry = new CollectorRegistry();
Gauge duration = Gauge.build()
.name("my_batch_job_duration_seconds").help("Duration of my batch job in seconds.").register(registry);
Gauge.Timer durationTimer = duration.startTimer();
try {
// Your code here.
myCode();
// This is only added to the registry after success,
// so that a previous success in the Pushgateway isn't overwritten on failure.
Gauge lastSuccess = Gauge.build()
.name("my_batch_job_last_success").help("Last time my batch job succeeded, in unixtime.").register(registry);
lastSuccess.setToCurrentTime();
} finally {
durationTimer.setDuration();
PushGateway pg = new PushGateway("172.16.124.40:9091");
pg.pushAdd(registry, "my_batch_job");
}
}
But when I run the project I am having the next error:
Exception in thread "main" java.lang.NoClassDefFoundError: io/prometheus/client/exporter/common/TextFormat
at io.prometheus.client.exporter.PushGateway.doRequest(PushGateway.java:299)
at io.prometheus.client.exporter.PushGateway.pushAdd(PushGateway.java:158)
at nemshelloworld.NemsHelloWorld.executeBatchJob2(NemsHelloWorld.java:78)
at nemshelloworld.NemsHelloWorld.main(NemsHelloWorld.java:33)
Caused by: java.lang.ClassNotFoundException: io.prometheus.client.exporter.common.TextFormat
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
You're missing the simpleclient_common module, which is a listed dependency of simpleclient_pushgateway so it sounds like your pom.xml or equivalent isn't right.
I'm writing a watson program to fetch personality traits. However, I'm running into errors with jar file issues.
import com.ibm.watson.developer_cloud.personality_insights.v3.PersonalityInsights;
import com.ibm.watson.developer_cloud.personality_insights.v3.model.Profile;
public JSONArray getPersonalityTraitsFromWatson(String text) {
JSONArray retval = null;
PersonalityInsights service = new PersonalityInsights("2016-10-20", "xxxx", "yyyy");
Profile response = service.getProfile(text).execute();
System.out.println("profile: " + response);
return retval;
}
The first problem is with okhttp3. I get a classnotfound error with JavaNetCookieJar. I'm currently using okhttp3 and javanetcookiejar is missing in it. I picked up the okhttp3 from MVNRepository.
Exception in thread "main" java.lang.NoClassDefFoundError: okhttp3/JavaNetCookieJar
at com.ibm.watson.developer_cloud.service.WatsonService.configureHttpClient(WatsonService.java:137)
at com.ibm.watson.developer_cloud.service.WatsonService.<init>(WatsonService.java:117)
at com.ibm.watson.developer_cloud.personality_insights.v3.PersonalityInsights.<init>(PersonalityInsights.java:52)
at com.ibm.watson.developer_cloud.personality_insights.v3.PersonalityInsights.<init>(PersonalityInsights.java:70)
at com.xyz.social.Watson.getPersonalityTraitsFromWatson(Watson.java:20)
at com.xyz.Testing.UnitTester.startUnitTest(UnitTester.java:1720)
at com.xyz.Testing.UnitTester.main(UnitTester.java:1850)
Caused by: java.lang.ClassNotFoundException: okhttp3.JavaNetCookieJar
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 7 more
I tried using "org.apache.servicemix.bundles.okhttp-3.2.0_1.jar" with and with the okhttp3.jar which clears the JavaNetCookieJar error but throws an SSLSocketFactory error (given below)
okhttp3.OkHttpClient$Builder.sslSocketFactory(Ljavax/net/ssl/SSLSocketFactory;Ljavax/net/ssl/X509TrustManager;)
Found the problem, the okhttp-urlconnection-3.8.1.jar & logging-interceptor-3.8.1.jar were required to be added. This fixed the problem.
I am having my java program for Neo4j with the Neo4j version as 2.3.0m1 .The jar files i was using for the connect was neo4j-desktop-2.3.0-M01.jar . Everything works fine. Now i want to load databases from 2.3.0-m3 version which is not opening in the current version. I am not able to find any jar files for this new version either .
This is my java code
import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Relationship;
import org.neo4j.graphdb.Transaction;
import org.neo4j.graphdb.factory.GraphDatabaseFactory;
public class Testing {
public static void main(String args[])
{
System.out.println("hai");
GraphDatabaseFactory dbFactory = new GraphDatabaseFactory();
GraphDatabaseService db= dbFactory.newEmbeddedDatabase("D:\\graph.db");
try (Transaction tx = db.beginTx()) {
System.out.println("began transaction");
tx.success();
}
catch(Exception e)
{
e.printStackTrace();
}
System.out.println("Done successfully");
}
}
This is the error i am getting if i try to open a higher version db (from 2.3.0-M3)
Exception in thread "main" java.lang.RuntimeException: Error starting org.neo4j.kernel.EmbeddedGraphDatabase, D:\data2\graph.db
at org.neo4j.kernel.InternalAbstractGraphDatabase.run(InternalAbstractGraphDatabase.java:314)
at org.neo4j.kernel.EmbeddedGraphDatabase.<init>(EmbeddedGraphDatabase.java:59)
at org.neo4j.graphdb.factory.GraphDatabaseFactory.newDatabase(GraphDatabaseFactory.java:107)
at org.neo4j.graphdb.factory.GraphDatabaseFactory$1.newDatabase(GraphDatabaseFactory.java:94)
at org.neo4j.graphdb.factory.GraphDatabaseBuilder.newGraphDatabase(GraphDatabaseBuilder.java:176)
at org.neo4j.graphdb.factory.GraphDatabaseFactory.newEmbeddedDatabase(GraphDatabaseFactory.java:66)
at Testing.main(Testing.java:19)
Caused by: org.neo4j.kernel.lifecycle.LifecycleException: Component 'org.neo4j.kernel.impl.transaction.state.DataSourceManager#258bb6ba' was successfully initialized, but failed to start. Please see attached cause exception.
at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:499)
at org.neo4j.kernel.lifecycle.LifeSupport.start(LifeSupport.java:108)
at org.neo4j.kernel.InternalAbstractGraphDatabase.run(InternalAbstractGraphDatabase.java:309)
... 6 more
Caused by: org.neo4j.kernel.lifecycle.LifecycleException: Component 'org.neo4j.kernel.NeoStoreDataSource#f1cb476' was successfully initialized, but failed to start. Please see attached cause exception.
at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:499)
at org.neo4j.kernel.lifecycle.LifeSupport.start(LifeSupport.java:108)
at org.neo4j.kernel.impl.transaction.state.DataSourceManager.start(DataSourceManager.java:117)
at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:493)
... 8 more
Caused by: org.neo4j.kernel.impl.storemigration.StoreUpgrader$UpgradingStoreVersionNotFoundException: 'neostore.nodestore.db' does not contain a store version, please ensure that the original database was shut down in a clean state.
at org.neo4j.kernel.impl.storemigration.UpgradableDatabase.checkUpgradeable(UpgradableDatabase.java:86)
at org.neo4j.kernel.impl.storemigration.StoreMigrator.needsMigration(StoreMigrator.java:158)
at org.neo4j.kernel.impl.storemigration.StoreUpgrader.getParticipantsEagerToMigrate(StoreUpgrader.java:259)
at org.neo4j.kernel.impl.storemigration.StoreUpgrader.migrateIfNeeded(StoreUpgrader.java:134)
at org.neo4j.kernel.NeoStoreDataSource.upgradeStore(NeoStoreDataSource.java:532)
at org.neo4j.kernel.NeoStoreDataSource.start(NeoStoreDataSource.java:434)
at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:493)
... 11 more
Also i am trying to download the enterprise version zip(2.3.0-M1) for windows from neo4j web site because i have the import-graphml feature in 2.3.0-M3 for which i want to move up to 2.3.0-M3.But the link provided in neo4j site is not downloading it completly.
http://neo4j.com/artifact.php?name=neo4j-enterprise-2.3.0-M01-windows.zip
Is there somewhere else this can be downloaded from
If you are doing upgrade of Neo4j you also need to upgrade database version.
neo4j.properties
# Enable this to be able to upgrade a store from an older version.
allow_store_upgrade=true
I am trying to use the Firebird embeded DB together with Hibernate, but I get the following error when trying to create the database:
Caused by: org.firebirdsql.jdbc.FBSQLException: GDS Exception. 335544344. I/O error during "CreateFile (open)" operation for file "D:\DB\FIREBIRD.FDB"
Error while trying to open file
null
at org.firebirdsql.jdbc.FBDataSource.getConnection(FBDataSource.java:123)
at org.firebirdsql.jdbc.AbstractDriver.connect(AbstractDriver.java:126)
at org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl.getConnection(DriverManagerConnectionProviderImpl.java:204)
at org.hibernate.internal.AbstractSessionImpl$NonContextualJdbcConnectionAccess.obtainConnection(AbstractSessionImpl.java:292)
at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.obtainConnection(LogicalConnectionImpl.java:214)
... 32 more
Caused by: org.firebirdsql.gds.GDSException: I/O error during "CreateFile (open)" operation for file "D:\DB\FIREBIRD.FDB"
Error while trying to open file
null
at org.firebirdsql.gds.impl.jni.JniGDSImpl.native_isc_attach_database(Native Method)
at org.firebirdsql.gds.impl.jni.BaseGDSImpl.iscAttachDatabase(BaseGDSImpl.java:158)
at org.firebirdsql.jca.FBManagedConnection.<init>(FBManagedConnection.java:105)
at org.firebirdsql.jca.FBManagedConnectionFactory.createManagedConnection(FBManagedConnectionFactory.java:490)
at org.firebirdsql.jca.FBStandAloneConnectionManager.allocateConnection(FBStandAloneConnectionManager.java:69)
at org.firebirdsql.jdbc.FBDataSource.getConnection(FBDataSource.java:120)
... 36 more
What I have done until now:
I've set the hibernate configuration.
Driver = "org.firebirdsql.jdbc.FBDriver",
Dialect = "org.hibernate.dialect.FirebirdDialect",
Url = "jdbc:firebirdsql:embedded:D:\DB\FIREBIRD.FDB",
I have added the jaybird-full jar to my classpath.
I have added jaybird22.dll, fbembed.dll (the whole folder) to my path.
The dlls seem to be loaded since if I delete the dlls I get and exception telling me that jaybird22.dll cannot be found.
Any idea what could be wrong ?
It seems the step I was missing was creating the database file manually:
FBManager manager = new FBManager(GDSType.getType("EMBEDDED"));
manager.start();
manager.createDatabase(myDbFile, username, password);
manager.stop();
I am trying to some pretty basic RMI:
// Context namingContext = new InitialContext();
Registry reg = LocateRegistry.createRegistry(9999);
for ( int i = 0; i < objs.length; i++ ) {
int id = objs[i].getID();
// namingContext.bind( "rmi:CustomObj" + id , objs[i] );
reg.bind( "CustomObj" + id , objs[i] );
}
That works without a hitch, but for future purposes, I need to use InitialContext.
Context namingContext = new InitialContext();
for ( int i = 0; i < objs.length; i++ ) {
int id = objs[i].getID();
namingContext.bind( "rmi:CustomObj" + id , objs[i] );
}
But I cannot get this to work. I have started rmiregistry from the command line. Is there an equivalent of LocateRegistry.createRegistry(int)? Or some other way to start the RMI registry / registry used by InitialContext from inside my class? (Instead of the command line)
Stack trace:
javax.naming.CommunicationException [Root exception is java.rmi.ServerException: RemoteException occurred in server thread; nested exception is:
java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is:
java.lang.ClassNotFoundException: bguiz.scratch.network.eg.Student]
at com.sun.jndi.rmi.registry.RegistryContext.bind(RegistryContext.java:126)
at com.sun.jndi.toolkit.url.GenericURLContext.bind(GenericURLContext.java:208)
at javax.naming.InitialContext.bind(InitialContext.java:400)
at bguiz.scratch.RMITest.main(RMITest.java:29)
Caused by: java.rmi.ServerException: RemoteException occurred in server thread; nested exception is:
java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is:
java.lang.ClassNotFoundException: bguiz.scratch.CustomObj
at sun.rmi.server.UnicastServerRef.oldDispatch(UnicastServerRef.java:396)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:250)
....(truncated)
EDIT: I will delete my own question in a couple of days, as there seems to be no answer to this (I haven't been able to figure it out myself). Last call for any biters!
After much tinkering, I've solved the problem. FYI, here's what it was:
The ClassNotFoundException is getting thrown because of RMI registry has its own classpath. It doesn't matter that the class containing the InitialContext has the custom objects on its classpath - The RMI registry must be initialised such that the custom objects are on its classpath as well.
To do this set the classpath environment value on the comman line prior to starting rmiregistry. If this classpath contains the custom object's class, the ClassNotFoundException is not thrown, and subsequently ServerException and `CommunicationException' are avoided.
java.lang.ClassNotFoundException: bguiz.scratch.network.eg.Student caused by
java.lang.ClassNotFoundException: bguiz.scratch.CustomObj
Check if this class is available ?
Is there an equivalent of LocateRegistry.createRegistry(int)?
No.
Or some other way to start the RMI registry / registry used by InitialContext from inside my class?
Only LocateRegistry.createRegistry().
I'm almost sure you need to specify the hostname in the URL. What exception & error message are you getting?