2018-04-26 02:18
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2018-04-05 16:21
Error ApiException{applicationExceptionType=ApiException, errors=[EntityNotFound{apiErrorType=EntityNotFound, errorString=EntityNotFound.INVALID_ID, fieldPath=operations[0].operand.adGrou… Read More
2018-04-05 16:16
Error ApiException{applicationExceptionType=ApiException, errors=[AuthenticationError{apiErrorType=AuthenticationError, errorString=AuthenticationError.CUSTOMER_NOT_FOUND, fieldPath=, rea… Read More
2018-03-26 19:19
Initializing a SetSet countrySet = Set.of("France","Belgium","Germany");Initializing a ListList countryList = List.of("France","Belgium","Germany");Initializing a MapMap countryCodeMap = Map… Read More
2018-03-26 19:15
ErrorThe method of(K, V, K, V, K, V) in the type Map is not applicable for the arguments (String, String, String, String, String)Error TypeCompile TimeCauseThe method of within Map clas… Read More
2018-03-26 18:47
Q1. What is project Jigsaw in Java 9 ?Ans. The projects aims to organize the Java source code into independent modules and hence facilitate building them independently.So now we will ha… Read More
2018-03-26 18:42
Java 9 would provide an error at compile time if there are different modules with the same package mapped to the same class loader and hence would provide a compile time check for this issue… Read More
2018-03-26 03:15
ErrorThe attribute "" is undefined for the annotation type JavaBeanError TypeCompile TimePossible CauseYou have specified an attribute with the annotation which is not allowed. Possible attr… Read More
2018-03-26 03:12
ErrorThe annotation @JavaBean is disallowed for this locationError TypeCompile TimePossible CauseAnnotation @JavaBean is not allowed at this location. It's a class level annotations and… Read More
2017-04-05 18:50
Interview Questions Search Interview Questions List By Company List By Topic Legacy - Index 500 Java / J2E… Read More
2016-12-26 20:01
Errororg.hibernate.MappingException: composite-id class must implement Serializable: at org.hibernate.mapping.RootClass.checkCompositeIdentifier(RootClass.java:263) at org.hibernate.mapping… Read More
2016-12-26 20:01
Errororg.hibernate.AnnotationException: No identifier specified for entity: at org.hibernate.cfg.InheritanceState.determineDefaultAccessType(InheritanceState.java:268) at org.hibernate.cfg… Read More
2016-12-26 20:01
NameTypePackageDetailConsoleHandlerClassjava.util.loggingJavaDocErrorManagerClassjava.util.loggingJavaDocFileHandlerClassjava.util.loggingJavaDocFilterInterfacejava.util.loggingJavaDocFormat… Read More
2016-12-26 20:01
NameTypePackageDetailArrayTypeClassjavax.management.openmbeanJavaDocAttributeClassjavax.managementJavaDocAttributeChangeNotificationClassjavax.managementJavaDocAttributeChangeNotificationFil… Read More
2016-12-26 20:01
NameTypePackageDetailArrayInterfacejava.sqlJavaDocBaseRowSetClassjavax.sql.rowsetJavaDocBatchUpdateExceptionClassjava.sqlJavaDocBlobInterfacejava.sqlJavaDocCachedRowSetInterfacejavax.sql.row… Read More
2016-12-26 20:01
NameTypePackageDetailAuthenticationExceptionClassjavax.security.saslJavaDocAuthorizeCallbackClassjavax.security.saslJavaDocRealmCallbackClassjavax.security.saslJavaDocRealmChoiceCallbackClas… Read More
2016-12-26 20:01
NameTypePackageDetailAbstractPreferencesAbstract Classjava.util.prefsJavaDocBackingStoreExceptionClassjava.util.prefsJavaDocInvalidPreferencesFormatExceptionClassjava.util.prefsJavaDocNodeCh… Read More
2016-12-26 20:01
NameTypePackageDetailChannelBindingClassorg.ietf.jgssJavaDocDelegationPermissionClassjavax.security.auth.kerberosJavaDocEncryptionKeyClassjavax.security.auth.kerberosJavaDocGSSContextInterfa… Read More
2016-12-26 20:01
NameTypePackageDetailAbstractMarshallerImplAbstract Classjavax.xml.bind.helpersJavaDocAbstractUnmarshallerImplAbstract Classjavax.xml.bind.helpersJavaDocAttachmentMarshallerClassjavax.xml.bi… Read More
2016-12-26 20:01
NameTypePackageDetailAbstractScriptEngineAbstract Classjavax.scriptJavaDocBindingsInterfacejavax.scriptJavaDocCompilableInterfacejavax.scriptJavaDocCompiledScriptClassjavax.scriptJavaDocInvo… Read More
2016-12-26 20:01
NameTypePackageDetailAttributeInterfacejavax.naming.directoryJavaDocAttributeInUseExceptionClassjavax.naming.directoryJavaDocAttributeModificationExceptionClassjavax.naming.directoryJavaDocA… Read More
2016-12-26 20:01
NameTypePackageDetailAccessExceptionClassjava.rmiJavaDocActivatableClassjava.rmi.activationJavaDocActivateFailedExceptionClassjava.rmi.activationJavaDocActivationDescClassjava.rmi.activation… Read More
2016-12-26 20:01
NameTypePackageDetailAWTEventListenerInterfacejava.awt.eventJavaDocAWTEventListenerProxyClassjava.awt.eventJavaDocAboutEventClassjava.awt.desktop.AboutEventJavaDocAboutHandlerInterfacejava.a… Read More
2016-12-26 20:01
NameTypePackageDetailClassDefinitionClassjava.lang.instrumentJavaDocClassFileTransformerInterfacejava.lang.instrumentJavaDocIllegalClassFormatExceptionClassjava.lang.instrumentJavaDocInstrum… Read More
2016-12-14 16:46
Thread class holds the definition of start method ( This is the method that starts execution of new thread and then calls run method within the scope of new thread ). Interfaces don't hold a… Read More
2016-12-14 16:46
Step 1 - Upgrade the required dependency , perform build and check build errorsStep 2.1 - If the error is of missing transitive dependency ( which is rare and means that the previous version… Read More
2016-12-14 16:46
Cold Deployment is a conventional deployment mechanism that follows the multi step process to deploy code changes to the running app i.e Build -> Deploy - Restart. whereas Hot Deployment… Read More
2016-12-14 16:46
At the beginning of an object's life, the Java virtual machine (JVM) allocates memory on the heap to accommodate the object's instance variables. When that memory is first allocated, however… Read More
2016-12-14 16:46
Final variable means a variable that has been declared final and hence cannot be de referenced after initialization. Effective final means a variable that has not been declared final but hav… Read More
2016-12-14 16:46
AdvantagesCan do meta object operations ( like validating something before creating objects , keep count of number of objects )Can do operations which have nothing to do with objects but sti… Read More
2016-12-14 16:46
Upstream project is a project whose successful build is required for executing the existing project build whereas Downstream project is the one that is waiting for the upstream project to bu… Read More
2016-12-14 16:46
Object Oriented Design Patterns is the science of identifying the pattern to make objects communicate in a way to effectively implement a Solution.Factory Design Patterns is the pattern that… Read More
2016-12-14 16:46
If the branch is to be created from Trunk and we are using Eclipse. Go to the Trunk Copy of the ProjectRight Click the project and then Click Branch/TagIn the Create Branch / Tag Dialog… Read More
2016-12-14 16:46
1)The overriding methods can throw any runtime Exception , here in the case of runtime exception overriding method (subclass method) should not worry about exception being thrown by supercla… Read More
2016-12-14 16:46
1. Static class is a class which cannot be instantiated and all its members are static whereas Singleton is the class that only permit creation of single object and then the object is reused… Read More
2016-12-14 16:46
Collections can only hold objects, It can't hold primitive data types.Collections have performance overheads as they deal with objects and offer dynamic memory expansion. This dynamic expans… Read More
2016-12-14 16:46
Enums in Java are used to declare predefined objects and then reuse them. they offer many benefits1. Enum instance are type safe and thread safe.2. Enum instances are singleton and hence reu… Read More
2016-12-14 16:46
They all does the same task i.e to compute statistical information on the stream of data. They differ by the way they store the statistical information as they expect a different data type o… Read More
2016-12-14 16:46
StringJoiner is a util method to construct a string with desired delimiter. This has been introduced with wef from Java 8.Sample CodeStringJoiner strJoiner = new StringJoiner(".");strJoiner… Read More
2016-12-14 16:46
Though It's often confused with each other, Object Creation ( Instantiation ) and Initialization ( Construction ) are different things in Java. Construction follows object creation.Object Cr… Read More
2016-12-14 16:46
Optional is a good way to protect application from runtime nullPointerException in case the the absent value has been represented as null. So basically Optional class provides the type check… Read More
2016-12-14 16:46
Predicate represents an anonymous function that accepts one argument and produces a result.Supplier represents an anonymous function that accepts no argument and produces a result.Consumer r… Read More
2016-12-14 16:46
1. It shouldn't result in infinite loop. Please make sure that you have a condition that will terminate the loop and that condition should be reached.2. Make sure to use the break statement… Read More
2016-12-14 16:46
1. First level cache is enabled by default whereas Second level cache needs to be enabled explicitly.2. First level Cache came with Hibernate 1.0 whereas Second level cache came with Hiberna… Read More
2016-12-12 17:54
Declaration is intimation to the compiler about the nature of Data a reference is going to hold.For example - List myList;Instantiation is reservation of memory.For examplemyList = new Array… Read More
2016-12-12 17:54
Yes, we can substitute outer classes wherever we need to have inner classes but Inner classes have advantage in certain cases and hence preferred -Ease - Why to implement a class outside if… Read More
2016-12-12 17:54
String str = new String("abc");String str1 = "abc";When we create a String using double quotes, JVM looks in the String pool to find if any other String is stored with same value. If found… Read More
2016-12-09 21:40
HashTable has been Deprecated as an alternative HashMap has been provided. The only difference between the HashTable and HashMap is that Hashtable is synchronized whereas HashMap is not. Mos… Read More
2016-12-09 21:40
Error"[FATAL] Non-parseable POM /pom.xml unexpected character in markup" while doing Maven BuildTypeBuildPossible CauseCheck if there are any problematic character at the specified line. If… Read More
2016-12-09 21:40
It could be worthy to move a method to util class if the method needs to be shared, doesn't require polymorphic behavior and need not be overridden in special cases.Don't belong to one… Read More
2016-12-09 21:40
1. Regulation / Enforcement / Policy / Contract , It's primary use2. Use as a collection of utility methods(since java 8 through default methods)3. Collecting constants together, As Interfac… Read More
2016-12-09 21:40
This depends on entirely upon the code type. For example 1.If its just logic, we can try it to short circuit or put the if / switch case with maximum probability in the beginning.2. Can… Read More
2016-12-09 17:41
ErrorThe parent project must have a packaging type of POM while creating a new Maven Module in EclipseCauseWe are trying to create a new sub module whose parent packaging is not POM Re… Read More
2016-12-09 17:41
1. Overriding method can not be more restrictive than the overridden method.reason : in case of polymorphism , at object creation jvm look for actual runtime object. jvm does not look for re… Read More
2016-12-09 17:41
Composition - has-a relationship between classes.Inheritance - is-a relationship between classes.Composition - Composing object holds a reference to composing classes and hence relationship… Read More
2016-12-09 17:41
"equals" is the method of object class which is supposed to be overridden to check object equality, whereas "==" evaluate to see if the object handlers on the left and right are pointing to… Read More
2016-12-09 17:41
1. String Pool - When a string is created and if it exists in the pool, the reference of the existing string will be returned instead of creating a new object. If string is not immutable, ch… Read More
2016-11-15 23:40
Errorjava.lang.NoClassDefFoundError: com/sun/jersey/api/client/config/ClientConfig com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:418) com.sun.jersey.spi.contain… Read More
2016-11-15 23:40
The software industry is packed with plenty of software and it can be used for various purposes. In the present day where software rules the business and other field, you cannot ignore the i… Read More
2016-11-15 23:40
ErrorInvalid packaging for parent POM /xyz/pom.xml , must be "pom" but is "jar".Error TypeBuildCauseThe specified parent has a packaging of jar instead of pom.ResolutionOpen the pom file for… Read More
2016-09-14 18:26
ErrorUnknown exception javax.ws.rs.WebApplicationException at com.sun.jersey.server.impl.uri.rules.TerminatingRule.accept(TerminatingRule.java:66) at com.sun.jersey.server.impl.uri.rule… Read More
2016-09-14 18:26
ProblemPrintWriter / BufferedWriter not printing to filePossible Causes1. No Permission on the FolderMake sure that you have required permission on the folder. Try to create an empty file to… Read More
2016-09-14 18:26
ErrorSEVERE: A message body reader for Java class , and Java type class , and MIME media type application/octet-stream was not found.The registered message body readers compatible with the M… Read More
2016-09-14 18:26
ErrorRule 0: org.apache.maven.plugins.enforcer.BanDuplicateClasses failed with message:Duplicate classes found: Found in: groupxxx:artifactxxx:jar:a.b:compile … Read More
2016-06-30 21:52
ErrorException in thread "main" com.sun.xml.bind.v2.runtime.IllegalAnnotationsException: n counts of IllegalAnnotationExceptions is a non-static inner class, and JAXB can't handle those.&nb&hell…Read More
2016-06-30 21:52
ErrorNo enclosing instance of type is accessible. Must qualify the allocation with an enclosing instance of type (e.g. x.new A() where x is an instance of ).Error TypeCompilationCauseTryin… Read More
2016-06-30 21:52
Errorerror: [core] No more than one JAX-RS entity parameter is allowed (all other parameters must be annotated with one of the JAX-RS resource parameter annotations)Error TypeMaven BuildPoss… Read More
2016-06-30 21:52
ErrorA TypeDefinition must have a no-arg constructor or be annotated with a factory method within JAXB EntityError TypeMaven Build EnunciatePossible CauseJAXB Entity doesn't contain a No-Arg… Read More
2016-06-21 22:19
ErrorFailed to execute goal org.codehaus.enunciate:maven-enunciate-plugin::docs (default) on project : Problem assembling the enunciate app. (unknown source position): Accessor of : An inter… Read More
2016-03-08 17:18
Q1. What is Apache Kafka ? Ans. Kafka is a distributed, partitioned, replicated commit log service. It provides the functionality of a messaging system through messages being written to logs… Read More
2016-03-07 18:08
WarningKafkaStream is a raw type. References to generic type KafkaStream<K,V> should be parameterizedError TypeCompile TimeCauseKafkaStream is of generic type and hence expects type pa… Read More
2016-02-10 19:08
Error"org.openqa.selenium.InvalidElementStateException: Element is read-only and so may not be used for actions" while sending keys to a textbox.Error TypeRunTimeCauseWebElement ( Text Box )… Read More
2016-02-10 18:52
Error"<ClassName> is not public in <PackageName> cannot be accessed from outside package"Error TypeCompile TimeCauseNon public Class <ClassName> is being accessed from… Read More
2016-02-09 20:57
ErrorCannot refer to an instance field url while explicitly invoking a constructor while calling super constructor with member element as the argument.Error TypeCompile TimeCauseInstance fie… Read More
2016-02-09 20:57
Error"Cannot refer to 'this' nor 'super' while explicitly invoking a constructor" while calling super constructor with this as the argument.Error TypeCompile TimeCauseCurrent instance cannot… Read More
2016-02-08 17:39
Errororg.openqa.selenium.NoSuchWindowException: Window not found. The browser window may have been closed while closing the window through driver i.e driver.close()Error TypeRunTimePossible… Read More
2016-02-02 00:34
NameTypeDescriptionDetailAclInterfaceInterface representing an Access Control List (ACL).DetailAclEntryInterfaceThis is the interface used for representing one entry in an Access Control Lis… Read More
2016-02-02 00:32
NameTypeDescriptionDetailAbstractMarshallerImplAbstract ClassPartial default Marshaller implementation.DetailAbstractUnmarshallerImplAbstract ClassPartial default Unmarshaller implementation… Read More
2016-02-02 00:15
NameTypeDescriptionDetailAbstractCellEditorAbstract ClassA base class for CellEditors, providing default implementations for the methods in the CellEditorDetailCellEditorListenerInterfaceCel… Read More
2016-02-02 00:14
NameTypeDescriptionDetailAbstractButtonAbstract ClassDefines common behaviors for buttons and menu items.DetailBasicArrowButtonClassJButton object that draws a scaled Arrow in one of the car… Read More
2016-02-01 21:20
Q . . Out of correct. Online Test Home Page Read More
2016-02-01 04:30
NameTypeDescriptionDetailXPathInterfaceXPath provides access to the XPath evaluation environment and expressions.DetailXPathEvaluationResultInterfaceThe XPathEvaluationResult interface repre… Read More
2016-02-01 04:29
NameTypeDescriptionDetailURLStreamHandlerFactoryInterfaceThis interface defines a factory for URL stream A URL stream handler factory is used as specified in theDetailURLStreamHandlerProvid… Read More
2016-02-01 04:28
NameTypeDescriptionDetailCertStoreExceptionClassAn exception indicating one of a variety of problems retrieving certificates and CRLs from a CertStore.DetailCertStoreParametersInterfaceA spe… Read More
2016-02-01 04:26
NameTypeDescriptionDetailDocumentTraversalInterfaceDocumentTraversal contains methods that create NodeIterators and TreeWalkers to traverse aDetailNodeIteratorInterfaceNodeIterators are used… Read More
2016-02-01 04:23
NameTypeDescriptionDetailJDBCTypeEnumDefines the constants that are used to identify generic SQL types, called JDBC types.DetailSQLTypeInterfaceAn object that is used to identify a generic S… Read More
2016-02-01 04:22
NameTypeDescriptionDetailPKIXBuilderParametersClassParameters used as input for the PKIX CertPathBuilder A PKIX CertPathBuilder uses these parameters to build a CertPath which has beenDetail… Read More
2016-02-01 04:19
NameTypeDescriptionDetailBiPredicateInterfaceRepresents a predicate (boolean-valued function) of two arguments.DetailDoublePredicateInterfaceRepresents a predicate (boolean-valued function)… Read More
2016-02-01 04:14
NameTypeDescriptionDetailCompletableFuture.AsynchronousCompletionTaskInterfaceA marker interface identifying asynchronous tasks produced by async methods.DetailConfiguration.ParametersInterf… Read More
2016-02-01 03:50
NameTypeDescriptionDetailBiFunctionInterfaceRepresents a function that accepts two arguments and produces a result.DetailDoubleFunctionInterfaceRepresents a function that accepts a double-va… Read More
2016-02-01 03:42
NameTypeDescriptionDetailBiConsumerInterfaceRepresents an operation that accepts two input arguments and returns no result.DetailBinaryOperatorInterfaceRepresents an operation upon two opera… Read More
2016-02-01 03:41
NameTypeDescriptionDetailBaseStreamInterfaceBase interface for streams, which are sequences of elements supporting sequential and parallel aggregate operations.DetailDoubleStreamInterfaceA s… Read More
2016-02-01 03:22
NameTypeDescriptionDetailAbstractElementVisitor6Abstract ClassA skeletal visitor of program elements with default behavior appropriate for the RELEASE_6DetailAbstractElementVisitor7Abstract… Read More
2016-02-01 03:21
NameTypeDescriptionDetailAbstractAnnotationValueVisitor6Abstract ClassA skeletal visitor for annotation values with default behavior appropriate for the RELEASE_6DetailAbstractAnnotationValu… Read More
2016-02-01 03:18
NameTypeDescriptionDetailThaiBuddhistChronologyClassThe Thai Buddhist calendar system.DetailThaiBuddhistDateClassA date in the Thai Buddhist calendar system.DetailThaiBuddhistEraEnumenum Tha… Read More
2016-02-01 03:00
NameTypeDescriptionDetailMinguoChronologyClassThe Minguo calendar system.DetailMinguoDateClassA date in the Minguo calendar system.DetailMinguoEraEnumAn era in the Minguo calendar system.Det… Read More
2016-02-01 02:58
NameTypeDescriptionDetailJapaneseChronologyClassThe Japanese Imperial calendar system.DetailJapaneseDateClassA date in the Japanese Imperial calendar system.DetailJapaneseEraClassAn era in t… Read More
2016-02-01 02:57
NameTypeDescriptionDetailIsoChronologyClassThe ISO calendar system.DetailIsoEraEnumAn era in the ISO calendar system.Detail Read More
2016-02-01 02:55
NameTypeDescriptionDetailHijrahDateClassA date in the Hijrah calendar system.DetailHijrahEraEnumAn era in the Hijrah calendar system.Detail Read More
2016-02-01 02:54
NameTypeDescriptionDetailAbstractChronologyAbstract ClassAn abstract implementation of a calendar system, used to organize and identify dates.DetailChronologyInterfaceA calendar system, used… Read More
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