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Saeed Muhaisen

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•Created by Saeed Muhaisen on 5/2/2025 in #java-help

Springboot Migration Automation

Is there a way to generate an SQL file for all changes that happens to my entities each time i start my app such that i can copy/paste this sql file into my production and manually alter my tables after i finish working on a feature in springboot that would change some entities?

96 replies

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•Created by Saeed Muhaisen on 7/22/2024 in #java-help

Springboot GenerationType.UUID not working

@Table(name = "Product")
public class Product {

    @Id
    @GeneratedValue(strategy = GenerationType.UUID)
    private UUID id;

@Table(name = "Product")
public class Product {

    @Id
    @GeneratedValue(strategy = GenerationType.UUID)
    private UUID id;

On create drop the sql field becomes:

id uuid not null primary key,

id uuid not null primary key,

upon inserting a row without specifying my Id field i get the error:

[23502] ERROR: null value in column "id" of relation "product" violates not-null constraint

[23502] ERROR: null value in column "id" of relation "product" violates not-null constraint

14 replies

JCHJava Community | Help. Code. Learn.

•Created by Saeed Muhaisen on 7/19/2024 in #java-help

Database import issue

4 replies

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•Created by Saeed Muhaisen on 7/14/2024 in #java-help

Spring boot - Detached entity passed to persist

In my UserRequest entity i have the following:

public class UserRequest {

    @OneToOne(cascade = CascadeType.ALL) //i tried persist
    @JoinColumn(name = "user_id")
    private User user;

public class UserRequest {

    @OneToOne(cascade = CascadeType.ALL) //i tried persist
    @JoinColumn(name = "user_id")
    private User user;

and in User i have the following:

public class User implements UserDetails {

    @OneToOne(mappedBy = "user")  //i tried without connecting it at all
    private UserRequest userRequest;

public class User implements UserDetails {

    @OneToOne(mappedBy = "user")  //i tried without connecting it at all
    private UserRequest userRequest;

when i try to save or update User through saving UserReqeust entity i get error: detached entity passed to persist, how can i fix it through connecting the classes correctly?

36 replies

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•Created by Saeed Muhaisen on 7/8/2024 in #java-help

Docker issue with Spring boot 3.2.2 and PostgreSQL on AWS

I have been running into issues figuring out how to dockerize my image and upload it to aws. Here is my dockerfile:

# Stage 1: Build the application
FROM maven:3.8.4-openjdk-17 AS build

WORKDIR /app
COPY pom.xml .
COPY src ./src
RUN mvn clean install

# Stage 2: Run the application
FROM openjdk:21
WORKDIR /app
COPY --from=build /app/target/HarmonyTracker-BE-0.0.1-SNAPSHOT.jar ./demo-aws.jar
COPY src/main/resources/application.properties /app/application.properties
COPY src/main/resources/keys/AuthKey_Z3XCBR246A.p8 /app/keys/AuthKey_Z3XCBR246A.p8
EXPOSE 8080
CMD ["java", "-jar", "demo-aws.jar"]

# Stage 1: Build the application
FROM maven:3.8.4-openjdk-17 AS build

WORKDIR /app
COPY pom.xml .
COPY src ./src
RUN mvn clean install

# Stage 2: Run the application
FROM openjdk:21
WORKDIR /app
COPY --from=build /app/target/HarmonyTracker-BE-0.0.1-SNAPSHOT.jar ./demo-aws.jar
COPY src/main/resources/application.properties /app/application.properties
COPY src/main/resources/keys/AuthKey_Z3XCBR246A.p8 /app/keys/AuthKey_Z3XCBR246A.p8
EXPOSE 8080
CMD ["java", "-jar", "demo-aws.jar"]

This is my docker-compose:

version: '3.8'
services:
  db:
    image: postgres
    environment:
      POSTGRES_DB: postgres
      POSTGRES_USER: postgres
      POSTGRES_PASSWORD: 123456
    volumes:
      - postgres_data:/var/lib/postgresql/data
    ports:
      - "5432:5432"

  app:
    build: .
    ports:
      - "8080:8080"
    environment:
      SPRING_DATASOURCE_URL: jdbc:postgresql://db:5432/postgres
      SPRING_DATASOURCE_USERNAME: postgres
      SPRING_DATASOURCE_PASSWORD: 123456
    depends_on:
      - db

version: '3.8'
services:
  db:
    image: postgres
    environment:
      POSTGRES_DB: postgres
      POSTGRES_USER: postgres
      POSTGRES_PASSWORD: 123456
    volumes:
      - postgres_data:/var/lib/postgresql/data
    ports:
      - "5432:5432"

  app:
    build: .
    ports:
      - "8080:8080"
    environment:
      SPRING_DATASOURCE_URL: jdbc:postgresql://db:5432/postgres
      SPRING_DATASOURCE_USERNAME: postgres
      SPRING_DATASOURCE_PASSWORD: 123456
    depends_on:
      - db

when composing or building i get errors in postgres connection attempt failed.

in pom.xml:

in pom.xml:

and:

and:

xml <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.11.0</version> ``` I ran to so much issues because i was on java 21 and mvn had errors, but at this point i cannot figure it out at all Any help would be truly appreciated. Errors i get when running the container are usually postgres connection issue and tomcat server not starting issues, i am sure i am making a mistake in connecting the app to postgres but idk what i am missing

9 replies

JCHJava Community | Help. Code. Learn.

•Created by Saeed Muhaisen on 4/3/2024 in #java-help

Opinion on Database Schema

101 replies

JCHJava Community | Help. Code. Learn.

•Created by Saeed Muhaisen on 1/26/2024 in #java-help

Security Question for Spring boot

34 replies

JCHJava Community | Help. Code. Learn.

•Created by Saeed Muhaisen on 1/21/2024 in #java-help

[GENERAL Q] Spring boot Authenticating Apple user credentials

I am working on React native for front end, i managed to do Apple Sign in button, and after correctly logging in i receive a response of credentials containing the following:

{
"authorizationCode": "....",
 "email": null, 
"fullName": {"familyName": null, "givenName": null, "middleName": null, "namePrefix": null, "nameSuffix": null, "nickname": null},
"identityToken":"....", 
"realUserStatus": 1, 
"state": null, 
"user": "...."}

{
"authorizationCode": "....",
 "email": null, 
"fullName": {"familyName": null, "givenName": null, "middleName": null, "namePrefix": null, "nameSuffix": null, "nickname": null},
"identityToken":"....", 
"realUserStatus": 1, 
"state": null, 
"user": "...."}

I send these information to my backend which is in Spring boot Now i would like to ask, generally what am i supposed to do with this information and how can i validate it so that i can send a response with my access_token and refresh_token back to the client? I am completly lost on this

4 replies

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•Created by Saeed Muhaisen on 1/21/2024 in #java-help

[GENERAL Q] Spring boot Authenticating Apple user credentials

I am working on React native for front end, i managed to do Apple Sign in button, and after correctly logging in i receive a response of credentials containning the following:

{
"authorizationCode": "....",
 "email": null, 
"fullName": {"familyName": null, "givenName": null, "middleName": null, "namePrefix": null, "nameSuffix": null, "nickname": null},
"identityToken":"....", 
"realUserStatus": 1, 
"state": null, 
"user": "...."}

{
"authorizationCode": "....",
 "email": null, 
"fullName": {"familyName": null, "givenName": null, "middleName": null, "namePrefix": null, "nameSuffix": null, "nickname": null},
"identityToken":"....", 
"realUserStatus": 1, 
"state": null, 
"user": "...."}

4 replies

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•Created by Saeed Muhaisen on 5/29/2023 in #java-help

I cannot use spring boot application on AWS EC2

Basically i have a running application on localhost, when i try to run my application on Aws ec2 , it gives me errors and i cannot understand why. I uploaded the full error file but here is what is i think causing the issue:

70 replies

JCHJava Community | Help. Code. Learn.

•Created by Saeed Muhaisen on 5/24/2023 in #java-help

dependency suddenly stopped working

    public static void printBlockChain(){
        AsciiTable at = new AsciiTable();
        at.addRule();
        at.addRow("Index","Hashcode","User","Transaction","Time");
        for (Block block : blockChain.getBlocks()) {
            at.addRule();
            at.addRow(block.getIndex(),block.getHash(),block.getTransactions()[0],block.getTransactions()[1],block.getTransactions()[2]);
        }
        at.addRule();
        String rend= at.render();
        System.out.println(rend);
    }

    public static void printBlockChain(){
        AsciiTable at = new AsciiTable();
        at.addRule();
        at.addRow("Index","Hashcode","User","Transaction","Time");
        for (Block block : blockChain.getBlocks()) {
            at.addRule();
            at.addRow(block.getIndex(),block.getHash(),block.getTransactions()[0],block.getTransactions()[1],block.getTransactions()[2]);
        }
        at.addRule();
        String rend= at.render();
        System.out.println(rend);
    }

I use this AsciiTable dependency, the import no longer function i get this error:

java: package de.vandermeer.asciitable does not exist

java: package de.vandermeer.asciitable does not exist

and

java: cannot find symbol
  symbol:   class AsciiTable
  location: class org.CS446.Controller

java: cannot find symbol
  symbol:   class AsciiTable
  location: class org.CS446.Controller

22 replies

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•Created by Saeed Muhaisen on 5/17/2023 in #java-help

Socket input stream keeps closing or EOF Exception

ServerSocket serverSocket = new ServerSocket(1234);
        Socket socket = serverSocket.accept();
       try {

           System.out.println("Client connected.");

           ObjectOutputStream outputStream = new ObjectOutputStream(socket.getOutputStream());
           ObjectInputStream inputStream = new ObjectInputStream(socket.getInputStream());
           while(true){
               RequestObject receivedObject = (RequestObject) inputStream.readObject();
               if (receivedObject.type == 1) {
                   applicationPublicKey = receivedObject.publicKey;
                   RequestObject responseObject = new RequestObject();
                   responseObject.setPublicKey(myPair.getPublic());
                   outputStream.writeObject(responseObject);
               } else if (receivedObject.type == 2) {
                   String msg = decrypt(receivedObject.getText().getBytes(), myPair.getPrivate());
                   System.out.println("Encrypted msg: " + receivedObject);
                   System.out.println("Decrypted msg: " + msg);
               }
           }
       }catch (Exception e){
            e.printStackTrace();
       }

ServerSocket serverSocket = new ServerSocket(1234);
        Socket socket = serverSocket.accept();
       try {

           System.out.println("Client connected.");

           ObjectOutputStream outputStream = new ObjectOutputStream(socket.getOutputStream());
           ObjectInputStream inputStream = new ObjectInputStream(socket.getInputStream());
           while(true){
               RequestObject receivedObject = (RequestObject) inputStream.readObject();
               if (receivedObject.type == 1) {
                   applicationPublicKey = receivedObject.publicKey;
                   RequestObject responseObject = new RequestObject();
                   responseObject.setPublicKey(myPair.getPublic());
                   outputStream.writeObject(responseObject);
               } else if (receivedObject.type == 2) {
                   String msg = decrypt(receivedObject.getText().getBytes(), myPair.getPrivate());
                   System.out.println("Encrypted msg: " + receivedObject);
                   System.out.println("Decrypted msg: " + msg);
               }
           }
       }catch (Exception e){
            e.printStackTrace();
       }

This is a chunk of my Server class, i want the input stream to keep listening to the socket if other requests are called. But it keeps giving me error with the stacktrace:

java.io.EOFException
    at java.base/java.io.ObjectInputStream$BlockDataInputStream.peekByte(ObjectInputStream.java:3244)
    at java.base/java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1708)
    at java.base/java.io.ObjectInputStream.readObject(ObjectInputStream.java:538)
    at java.base/java.io.ObjectInputStream.readObject(ObjectInputStream.java:496)
    at Server.main(Server.java:29)

java.io.EOFException
    at java.base/java.io.ObjectInputStream$BlockDataInputStream.peekByte(ObjectInputStream.java:3244)
    at java.base/java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1708)
    at java.base/java.io.ObjectInputStream.readObject(ObjectInputStream.java:538)
    at java.base/java.io.ObjectInputStream.readObject(ObjectInputStream.java:496)
    at Server.main(Server.java:29)

Line 29 in server is :

RequestObject receivedObject = (RequestObject) inputStream.readObject();

RequestObject receivedObject = (RequestObject) inputStream.readObject();

38 replies

JCHJava Community | Help. Code. Learn.

•Created by Saeed Muhaisen on 12/21/2022 in #java-help

Weird issue that gets solved with println

17 replies

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