IntelliJ IDEA generating serialVersionUID

Question

How do generate this value in IntelliJ IDEA   I go to Settings -  Errors -  Serialization issues -  Serializable class without    serialVersionUID     but it still doesn t show me the warning  My class PKladrBuilding parent implements interface Serializable   Part of the code   public class PKladrBuilding extends PRQObject  public abstract class PRQObject extends PObject  public abstract class PObject implements Serializable

User · Answer

Install the GenerateSerialVersionUID plugin by Olivier Descout   Go to  menu File   Settings   Plugins   Browse repositories   GenerateSerialVersionUID  Install the plugin and restart   Now you can generate the id from menu Code   Generate   serialVersionUID  or the shortcut

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I am using Android Studio 2 1 and I have better consistency of getting the lightbulb by clicking on the class Name and hover over it for a second

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In order to generate the value use   private static final long serialVersionUID    randomLong L   END    and provide the randomLong template variable with the following value  groovyScript  new Random   nextLong   abs      https   pharsfalvi wordpress com 2015 03 18 adding-serialversionuid-in-idea

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Add a live template called  ser  to the other group  set it to  Applicable in Java  declaration   and untick  Shorten FQ names   Give it a template text of just    serial    Now edit variables and set serial to   groovyScript   System env JDK HOME   bin serialver -classpath   com intellij openapi fileEditor FileDocumentManager instance getFile  editor document  path replaceAll   java         replaceAll   src     build classes         1  execute   text replaceAll              qualifiedClassName      It assumes the standard Gradle project layout  Change  build  to  target  for Maven

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Easiest modern method  Alt Enter on  private static final long serialVersionUID       IntelliJ will underline the space after the    put your cursor on it and hit alt Enter  Option Enter on Mac   You ll get a popover that says  Randomly Change serialVersionUID Initializer   Just hit enter  and it ll populate that space with a random long

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In addition you can add live template that will do the work   To do it press Ctrl Alt S -   Live Templates  section -  other  or w e you wish   And then create a new one with a definition like this   private static final long serialVersionUID   1L   END    Then select definition scope and save it as  serial   Now you can type serialTAB in class body

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Without any plugins  You just need to enable highlight in IntelliJ   IntelliJ Preferences - gt  Editor - gt  Inspections - gt  Java - gt  Serialization issues - gt  Serializable class without  serialVersionUID  - set flag and click  OK    Now  if your class implements Serializable  you will see highlight  and alt Enter on class name will propose to generate private static final long serialVersionUID   PS  Taken from here

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I am not sure if you have an old version of IntelliJ IDEA  but if I go to menu File   Settings      Inspections   Serialization issues   Serializable class without  serialVersionUID   enabled  the class you provide give me warnings     If I try the first class I see     BTW  It didn t show me a warning until I added     to the end of each class to fix the compile error

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If you want to add the absent serialVersionUID for a bunch of files  IntelliJ IDEA may not work very well  I come up some simple script to fulfill this goal with ease   base dir   pwd  src dir  base dir src main java ic api cp  base dir target classes  while read f do     clazz   f            clazz   clazz   java       seruidstr   serialver -classpath  ic api cp  clazz   cut -d     -f 2   sed -e  s   s           perl -ni bak -e  print     printf qq  s n   q     private  seruidstr  if  public class    src dir  f done   You save this script  say as add serialVersionUID sh in your   bin folder  Then you run it in the root directory of your Maven or Gradle project like   add serialVersionUID sh  lt  myJavaToAmend lst   This  lst includes the list of Java files to add the serialVersionUID in the following format   com abc ic api model domain item BizOrderTransDO java com abc ic api model domain item CardPassFeature java com abc ic api model domain item CategoryFeature java com abc ic api model domain item GoodsFeature java com abc ic api model domain item ItemFeature java com abc ic api model domain item ItemPicUrls java com abc ic api model domain item ItemSkuDO java com abc ic api model domain serve ServeCategoryFeature java com abc ic api model domain serve ServeFeature java com abc ic api model param depot DepotItemDTO java com abc ic api model param depot DepotItemQueryDTO java com abc ic api model param depot InDepotDTO java com abc ic api model param depot OutDepotDTO java   This script uses the JDK serialVer tool  It is ideal for a situation when you want to amend a huge number of classes which had no serialVersionUID set in the first place while maintain the compatibility with the old classes

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With version v2018 2 1  Go to      Preference   Editor   Inspections   Java   Serialization issues   toggle  Serializable class without  serialVersionUID      A warning should appear next to the class declaration

User · Answer

Another way to generate the serialVersionUID is to use  gt Analyze  gt Run Inspection by Name from the context menu   or the keyboard short cut  which is ctrl alt shift i by default  and then type  Serializable class without  serialVersionUID    or simply type  serialVersionUID  and the type ahead function will find it for you    You will then get a context menu where you can choose where to run the inspections on  e g  all from a specific module  whole project  one file        With this approach you don t even have to set the general inspection rules to anything

User · Answer

After spending some time on Serialization  I find that  we should not generate serialVersionUID with some random value  we should give it a meaningful value    Here is a details comment on this  I am coping the comment here       Actually  you should not be  generating  serial version UIDs  It is a dumb  feature  that stems from the general misunderstanding of how that ID is used by Java  You should be giving these IDs meaningful  readable values  e g  starting with 1L  and incrementing them each time you think the new version of the class should render all previous versions  that might be previously serialized  obsolete   All utilities that generate such IDs basically do what the JVM does when the ID is not defined  they generate the value based on the content of the class file  hence coming up with unreadable meaningless long integers  If you want each and every version of your class to be distinct  in the eyes of the JVM  then you should not even specify the serialVersionUID value isnce the JVM will produce one on the fly  and the value of each version of your class will be unique  The purpose of defining that value explicitly is to tell the serialization mechanism to treat different versions of the class that have the same SVUID as if they are the same  e g  not to reject the older serialized versions  So  if you define the ID and never change it  and I assume that s what you do since you rely on the auto-generation  and you probably never re-generate your IDs  you are ensuring that all - even absolutely different - versions of your class will be considered the same by the serialization mechanism  Is that what you want  If not  and if you indeed want to have control over how your objects are recognized  you should be using simple values that you yourself can understand and easily update when you decide that the class has changed significantly  Having a 23-digit value does not help at all    Hope this helps  Good luck

[java] IntelliJ IDEA generating serialVersionUID

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