src/main/java/de/szut/lf8_starter/project/ProjectService.java

@@ -1,8 +1,10 @@
 package de.szut.lf8_starter.project;
 
+import de.szut.lf8_starter.exceptionHandling.ResourceNotFoundException;
 import org.springframework.stereotype.Service;
 
 import java.util.List;
+import java.util.Optional;
 
 @Service
 public class ProjectService {
@@ -19,4 +21,14 @@ public class ProjectService {
     public List<ProjectEntity> readAll() {
         return this.projectRepository.findAll();
     }
+
+    public ProjectEntity findById(Long id) {
+        Optional<ProjectEntity> articleEntity = projectRepository.findById(id);
+
+        if (articleEntity.isEmpty()) {
+            throw new ResourceNotFoundException("Project with id " + id + " not found");
+        }
+
+        return articleEntity.get();
+    }
 }

src/main/java/de/szut/lf8_starter/project/action/CreateProjectAction.java

@@ -1,5 +1,8 @@
-package de.szut.lf8_starter.project;
+package de.szut.lf8_starter.project.action;
 
+import de.szut.lf8_starter.project.ProjectEntity;
+import de.szut.lf8_starter.project.ProjectMapper;
+import de.szut.lf8_starter.project.ProjectService;
 import de.szut.lf8_starter.project.dto.CreateProjectDto;
 import de.szut.lf8_starter.project.dto.GetProjectDto;
 import io.swagger.v3.oas.annotations.Operation;

src/main/java/de/szut/lf8_starter/project/action/GetAllProjectsAction.java

@@ -1,32 +1,36 @@
-package de.szut.lf8_starter.project;
+package de.szut.lf8_starter.project.action;
 
+import de.szut.lf8_starter.project.ProjectMapper;
+import de.szut.lf8_starter.project.ProjectService;
 import de.szut.lf8_starter.project.dto.GetProjectDto;
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.media.Content;
 import io.swagger.v3.oas.annotations.media.Schema;
 import io.swagger.v3.oas.annotations.responses.ApiResponse;
 import io.swagger.v3.oas.annotations.responses.ApiResponses;
-import org.springframework.web.bind.annotation.*;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
 
 import java.util.List;
 
 @RestController
 @RequestMapping(value = "projects")
-public class ProjectController {
+public class GetAllProjectsAction {
     private final ProjectService service;
     private final ProjectMapper projectMapper;
-    public ProjectController(ProjectService service, ProjectMapper projectMapper) {
+
+    public GetAllProjectsAction(ProjectService service, ProjectMapper projectMapper) {
         this.service = service;
         this.projectMapper = projectMapper;
     }
 
     @Operation(summary = "returns all projects")
     @ApiResponses(value = {
-            @ApiResponse(responseCode = "200", description = "all projects",
+            @ApiResponse(responseCode = "200", description = "all projects", content = {
-                    content = {@Content(mediaType = "application/json",
+                    @Content(mediaType = "application/json", schema = @Schema(implementation = GetProjectDto.class))
-                            schema = @Schema(implementation = GetProjectDto.class))}),
+            }),
-            @ApiResponse(responseCode = "401", description = "not authorized",
+            @ApiResponse(responseCode = "401", description = "not authorized", content = @Content)})
-                    content = @Content)})
     @GetMapping
     public List<GetProjectDto> findAll() {
         return this.service

src/main/java/de/szut/lf8_starter/project/action/GetProjectAction.java

@@ -0,0 +1,28 @@
+package de.szut.lf8_starter.project.action;
+
+import de.szut.lf8_starter.project.ProjectEntity;
+import de.szut.lf8_starter.project.ProjectMapper;
+import de.szut.lf8_starter.project.ProjectService;
+import de.szut.lf8_starter.project.dto.GetProjectDto;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+@RestController
+@RequestMapping(value = "projects")
+public class GetProjectAction {
+    private final ProjectService projectService;
+    private final ProjectMapper projectMapper;
+
+    public GetProjectAction(ProjectService projectService, ProjectMapper projectMapper) {
+        this.projectService = projectService;
+        this.projectMapper = projectMapper;
+    }
+
+    @GetMapping("/{id}")
+    public ResponseEntity<GetProjectDto> findArticleById(@PathVariable Long id) {
+        ProjectEntity project = this.projectService.findById(id);
+
+        return new ResponseEntity<>(this.projectMapper.mapToGetDto(project), HttpStatus.OK);
+    }
+}