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HashMap : ConcurrentHashMap : API Reference: final V putVal(K key, V value, boolean onlyIfAbsent) { if (key == null || value == null) throw new NullPointerException();
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We can use below solutions for converting ArrayList to Array in java. Solution 1 : Convert arraylist to array using Java 8 Stream API. Output : Solution 2 : Convert …
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Step 1 : Add below dependency in POM.xml Note : If you are using Spring Boot application above dependency available inside ,no need to add externally. Step 2 : Use …
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Step 1 : Download source code using link. Step 2 : Import downloaded project in to Eclipse. Step 3 : Build and run the application using tomcat server. Step 4: …
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Temporary Solutions : Open catalina.sh from tomcat/bin. Set or change JAVA_OPTS to Restart the tomcat server. Best Solution: Use local variables wherever possible. Make sure you select the correct object …
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Step 1: Download JDK from official website. Link : https://www.oracle.com/in/java/technologies/javase/javase-jdk8-downloads.html Step 2: Install Downloaded JDK in to system. Step 3: Set the java path in environment variable. Step 4: Verify …
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1. What is the use of Spring Boot ? Spring Boot help you develop Spring application as quickly as possible. Spring Boot is a Spring module which provides RAD (Rapid …
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How do you configure hibernate? Why we need hibernate over JDBC? What are the annotation used in Hibernate? @Entity, @Id, @Column, @ManyToOne, @OneToMany Explain Hibernate Cache Based on given id …
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1.What is the Servlet? Ans : A servlet is a Java technology-based Web component. Managed by a web server or Application server (Tomcat, Weblogic, Glashifish..etc). Servlet generates dynamic content and …
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1: What is the difference between Database and Database management system? Ans: Database is a collection of interrelated data. Database management system is a software which can be used to …
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