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What are the technologies that a Java developer should know?
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There are some skills, which should be known by a Java developer and they should have the necessary experience.

1. Concepts of object-oriented programming: Since it is very important when applied to the data structure, since it is necessary to understand the data type of the data structure, as well as help to understand the types of operations ( functions) to apply. The data structure.

2. Abstract classes and interfaces: Java developers need to know the difference between Abstract Class and Interface, but both are used a lot just to get abstraction.

3. Builders: There are two types of builders that are mainly found in Java. The default constructor does not follow any parameter and another is a parameterized constructor that requires some parameters.

4. IO file and serialization: This is a very important mechanism that is required to find the I / O error so that appropriate actions can be taken immediately and is widely used in application programming.

5. Differences b / w List, Map and Set: To work with the framework of the Java collection, we should have knowledge of these three important interfaces to be used, where? And also how will it work with its functionalities?

6. Access modifiers and non-access modifiers in Java: Java developers must understand all this. In addition, the Java access modifiers will be classified into 4 parts.

Private

Default

Protected

And public

7. JVM and understanding of memory management: Understanding memory management is essential for new object assignments to give spaces and eliminate unused objects in the administrator's memory. Below this the following topics should be covered, such as:

The heap with the nursery.

Object assignments

Garbage collections

8. Design patterns in Java: The concept of design patterns is very important in the development of Java, so you must fully understand with your categories the creational, structural and behavioral design patterns.

Apart from these, there are many skills that Java developers should know, such as the complete idea about Exceptions (checked and unverified), Generics, multithreading and synchronization, Java Keywords (static, final, volatile, etc.)

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1) Data structure and figurings (time impulse, attempts, tree, hash, related rundown, set, plot, red/reduce, stack, organizing, look for, enthusiastic, Knuth-Morris-Pratt, diagrams). 

2) Lucene, Hadoop

3) Web affiliations (REST, Big JAX-WS, JAX-RS) 

4) Cloud figuring. 

5) No SQL, enormous data. 

6) Spring, Hibernate, JPA 

7) Push. 

8) Servlets. And all other J2EE parts. 

9) Performance checking, tuning, profiling. 

10) DB, SQL. 

11) Common perspectives. 

12) JavaScript, jQuery, ExtJS, google end. 

13) Maven, bug. 

14) Estimation systems.

15) Agile. 

16) Web: JSP, Servlets, Push, Web affiliation, Comet, Data Streaming enhancements 

17) Profiling: How to screen execution, memory utilize and so forth of an application? Cover profiler, TPTP, JProfiler. Undeniable memories in JVM (stack, static, Eden, Perm Gen). Mix drives: JMX, JPDA, JVM TI/DI, JDWP, JDI, JMS, RPC, RMI, JCA. 

18) JNI, Socket. 

19) OOAD benchmarks 

20) Web/App Server: Tomcat, JBoss. 

21) JMS

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From the little experience I have with JAVA developers I have as friends I can only advice them at as a JAVA developer you must be in tuned with latest developments in the JAVA world and Technology realm as a whole.

Here are few things I believe every JAVA developer no matter the level the person is must know.

Every Java Developer should know the following core java concepts -

OOPs Concepts

Abstract Classes and Interfaces

Constructors

File IO and Serialization

Collections - List , Map , Set

Access Specifiers

Exceptions - Checked , Unchecked

Generics

Java Keywords - Static , Final , volatile, synchronized , transient, this super etc.

JVM and Memory Management

Multithreading and Synchronization

Design Pattern

Knowing all these doesn't mean you've known it all, you still have to keep up with recent trends and learn new things. Don't limit yourself but instead expand your horizon.

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Each Java Developer should know the running with Topics : 

Center Java : 

1. Question Oriented Programming 

Classes and Objects 

Fields and Methods 

Encapsulation 

Access Modifiers 

Legacy 

Polymorphism 

2. Strategies 

Calling Methods 

Depicting Methods 

Strategy Parameters 

Degree 

3. Datatype and Variables 

Unpleasant Datatype 

Non-Primitive Datatype 

Show 

4. Java.lang Package 

5. Rejection Handling 

6. Mutlithreading 

7. Java.util Package 

8. Storing up Frameworks 

9. Java.io bundle 

10. Enums, Reflections 

11. Illuminations 

Advance Java : 

JDBC 

Servlets 

JSP 

JEE Design Pattern 

MVC Architecture 

Systems : 

Rest 

Spring 

XML (Extensible Markup Language) 

Web Services 

Contraptions And Servers : 

Ace 

Log4J 

JSON 

Junit 

Cover 

Tomcat 

JBoss 

Database : 

DriversNormalization/Denormalization 

SQL Queries - Inner Outer Joins, Group By 

Set away Procedures 

Cursors 

Triggers 

When You expert in every last one of these subjects in Java then you change into a Java Developer. 

On the off chance that you are checking for an average idea and valuation for Java I would support an isolated class under the supervision and direction of specialists.

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You can't in any capacity, shape or frame know all the Java progresses out there in light of the fact that no association will enable you to. One association will swear by the Spring framework while distinctive associations like LinkedIn have continued forward and are into the PlayFramework. 

Regardless, let me give you an once-over of 10 progresses that will constantly contribute you front of your restriction paying little notice to the association. 

10 Skills that will make you a mind blowing Java Developer: 

No short of what one MVC Framework like JSF, Playframework, Struts, or Spring MVC 

Rest or JPA for databases 

Dependence Injection (@Resource) 

Chemical based Web Services (JAX-WS) 

Some frame mechanical assembly (Ant, Maven, et cetera.) 

JUnit (or other Unit Testing structure) 

Frame Control by and large Git 

JSTL 

Application server/compartment setup organization and application sending (paying little mind to whether it is WebSphere, Tomcat, JBoss, et cetera you need to know where your application runs and how to improve its execution) 

AJAX 

Regardless being a splendid Java build takes logically that essentially knowing your stuck.

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Java movement has made and has ended up being to a remarkable degree monstrous in 10 years back. There are basically such a significant number of things and its all around boundless for one individual to star every last one of them. Your understanding about Java movement will depend totally on what you destroying. 

In any movement say Java or some other vernacular, it is more crucial and beneficial to know the tongue nuts and bolts totally (OOP examinations, interfaces, class, objects, threading et cetera.) instead of specific structures or language structure. It's for each condition easy to quickly learn new sorts of advancement when you ace the stray pieces. 

1. Have strong foundation and cognizance on OO Principles 

For a Java originator, having strong acknowledgment on Object Oriented Programming is a certain need. Without having a strong foundation on OOPS, one can't get a handle on the faultlessness of an Object Oriented Programming lingo like Java. If you don't have shrewd idea on what OOPS is, despite how you are using OOP vernacular you may be so far coding in procedural way. Essentially pondering OO oversee definitions won't reinforce much. We should know how to apply those OO models in arranging an answer in OO way. So one should have a strong learning on Object showing up, Inheritance, Polymorphism, Design Patterns. 

2. Ace inside APIs 

It doesn't have any kind of effect how strong you are concerning hypothetical learning in case you don't have the foggiest thought regarding the vernacular makes and focus APIs. On the off chance that there ought to emerge an event of Java, one should have to an extraordinary degree strong hands-on fuse with focus APIs like java.lang.*, I/O, Exceptions, Collections, Generics, Threads, JDBC and so forth. Concerning Web application overhaul, paying little respect to which structure you are using having strong data on Servlets, JSPs is a certain fundamental. 

3. Keep coding 

Things look less impulsive while examining them hypothetically. We can give a response for an issue successfully on a fundamental level. In any case, we can value the centrality of the issue when we start completing our method. You will come to know the tongue hindrances, or strategy best practices while coding. So keep coding. 

4. Purchase in to trades 

We are not alone. There are packs of people taking care of for all intents and purposes indistinguishable advances that we are destroying. While finishing a noteworthy check of thought on a structure may not give you genuine bothers, when you start using it on veritable exercises you will defy odd issues and you won't find any outline in their official documentation. When starting to deal with another enhancement the best and first movement is purchase in to the essential progress exchanges. Whatever the issue you are facing, someone else on the planet may have authentically stood up to it already and might have found the blueprint. In addition, it would be unbelievably astonishing if you can answer the interest asked by other get-together customers. 

5. Search for after makes and respond 

As I already let you know are not alone. There are a broad number of vigorous enhancement parts far and wide blogging their bits of learning on progress. You can see trade perspectives of same enhancement for web diaries. Someone can find outstanding features in a progress and someone else feels its a numbskull structure giving his own one of a kind reasons of why he felt like that. So you can see both extraordinary and dreadful of a progression on objectives. Search for after the amazing objectives and respond/comment on posts with your decision on that. 

6. Read open source structures source code 

A better than average creator will see how to use a structure. Notwithstanding, if you should be a remarkable fashioner you ought to consider the source code of various beneficial, grasped frameworks where you can see the internal working area of the structure and heap of best practices. It will help a ton in using the structures in particularly practical way. 

7. Know the enhancement structures 

In the open source programming overhaul enhancement structures keep advancing. When you get brilliant thought on a structure that may end up old and some new out of the compartment new framework came into picture with super-strategy of features. The issue which you are attempting to settle with your present framework may start at now enlightened by the new structure with a specific line clearly of movement. So keep an eye out for whats coming in and whats going out. 

8. Keep consistently used code pieces/utilities strong 

Extra time you may need to shape/copy stick same piece of code/outline again and again. Keeping those kind obviously of activity pieces like log4.properties, jdbc structure et cetera and utilities like StringUtils, ReflectionUtils, DBUtils will be more beneficial. I know it itself won't make you earth shattering expert. In any case, just imagine some co-plan asks for that you help in getting the once-over of estimations of a property from a get-together of articles and a concise range later you basically used your ReflectionUtil and gave the procedure in couple of minutes. That will make you momentous. 

9. Know differing redesign frameworks 

Affirm of various sorts of approachs like Agile, SCRUM, XP, Waterfall et cetera. Nowadays picking the enhancement approach depends on the client. A couple of clients lean toward Agile and a few clients are content with course show up. So having an idea on various methods would be impossible. 

10. Record/blog your considerations on progression 

In standard business you may learn new things, new and better system for completing things, upheld structures, partner bits of knowledge. Keep revealing those bits of information or blog it and offer over the system. Imagine you managed an odd issue occurred while finishing a direct POC and you blogged about it. May be some engineer elsewhere on the planet is going up against a relative issue on a creation sent application. Think how basic that response for that designer.

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