Add boot4-migration module: one Boot 3.5.16 service migrated to 4.1.2, with the real compile, start-up, silent and test failures captured at each step

Co-Authored-By: Claude Sonnet 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_017ic4b4VQVEJWetTT1dYzyJ
2026-10-29 05:57:26 +00:00
parent fd0cf9b527
commit 85074ed51a
45 changed files with 1021 additions and 0 deletions
@@ -0,0 +1,23 @@
+$ mvn package   # before/ as written: Boot 3.5.16, JDK 25.0.5
+CSRFPROBE status=403
+[INFO] Tests run: 3, Failures: 0, Errors: 0, Skipped: 0
+[INFO] BUILD SUCCESS
+
+$ java -jar migration-demo-1.0.0.jar   # Boot 3.5.16
+GET /summary
+{"id":1,"title":"Hello","createdAt":"2026-01-02T03:04:05Z","author":"ankur"}  -> HTTP 200
+GET /greetings/1
+{"id":1,"title":"Hello #1","createdAt":"2026-01-02T03:04:05Z","author":"ankur"}  -> HTTP 200
+GET /greetings/count
+{"rows":3}  -> HTTP 200
+GET /aspect
+{"interceptions":1}  -> HTTP 200
+GET /gateway
+{"client":"DefaultRestClient"}  -> HTTP 200
+GET /actuator/metrics (first 60 chars)
+{"names":["application.ready.time","application.started.time
+GET /actuator/health   (groups and status only)
+  groups=None status=UP components=['db', 'diskSpace', 'ping', 'ssl']
+GET /actuator/health/liveness
+  -> HTTP 404
+after 40 more requests, log directory holds:  1 app.log; 5 app.log.<date>.<n>.gz;  (app.log is 342 bytes; limit set is logging.file.max-size=2KB or its 4.1 replacement)
@@ -0,0 +1,35 @@
+$ mvn -DskipTests package   # same sources, same pom, only <parent><version> 3.5.16 -> 4.1.2
+[ERROR]     'dependencies.dependency.version' for org.springframework.boot:spring-boot-starter-aop:jar is missing. @ line 25, column 17
+[ERROR] 'dependencies.dependency.version' for org.springframework.boot:spring-boot-starter-aop:jar is missing. @ line 25, column 17
+
+# spring-boot-starter-aop has no managed version any more. Rename it to spring-boot-starter-aspectj and try again:
+$ mvn compile
+[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.15.0:compile (default-compile) on project migration-demo: Fatal error compiling: Cannot load from object array because "this.hashes" is null
+[INFO] BUILD FAILURE
+# Maven's compiler plugin 3.15.0 on JDK 25 crashed inside javac instead of listing the errors, so ask javac directly:
+$ javac -cp $(mvn dependency:build-classpath) src/main/java/**/*.java
+SecurityConfig.java:3: error: package org.springframework.boot.autoconfigure.security does not exist
+import org.springframework.boot.autoconfigure.security.SecurityProperties;
+JsonConfig.java:5: error: package com.fasterxml.jackson.core does not exist
+import com.fasterxml.jackson.core.JsonGenerator;
+JsonConfig.java:6: error: package com.fasterxml.jackson.databind does not exist
+import com.fasterxml.jackson.databind.JsonSerializer;
+JsonConfig.java:7: error: package com.fasterxml.jackson.databind does not exist
+import com.fasterxml.jackson.databind.SerializerProvider;
+JsonConfig.java:8: error: cannot find symbol
+import org.springframework.boot.jackson.JsonComponent;
+JsonConfig.java:12: error: cannot find symbol
+public class JsonConfig extends JsonSerializer<Greeting> {
+JsonConfig.java:11: error: cannot find symbol
+@JsonComponent
+JsonConfig.java:14: error: cannot find symbol
+    public void serialize(Greeting g, JsonGenerator gen, SerializerProvider sp) throws IOException {
+JsonConfig.java:14: error: cannot find symbol
+    public void serialize(Greeting g, JsonGenerator gen, SerializerProvider sp) throws IOException {
+SecurityConfig.java:14: error: cannot find symbol
+    @Order(SecurityProperties.BASIC_AUTH_ORDER)
+SecurityConfig.java:16: error: method authorizeHttpRequests in class HttpSecurity cannot be applied to given types;
+        http.authorizeHttpRequests()
+JsonConfig.java:13: error: method does not override or implement a method from a supertype
+    @Override
+javac error count: 12
@@ -0,0 +1,11 @@
+$ # s2 = before/ + Boot 4.1.2 + aop->aspectj + JsonConfig and SecurityConfig ported (imports only); every other dependency untouched
+$ mvn -DskipTests package
+[INFO] BUILD SUCCESS
+
+$ java -jar migration-demo-1.0.0.jar
+APPLICATION DID NOT START. The failure report:
+APPLICATION FAILED TO START
+***************************
+Description:
+Parameter 0 of constructor in com.ankurm.migration.Gateway required a bean of type 'org.springframework.web.client.RestClient$Builder' that could not be found.
+Action:
@@ -0,0 +1,25 @@
+$ # s3 = s2 + spring-boot-starter-restclient (the only thing the start-up failure asked for). Flyway, properties and the rest still Boot 3 style.
+$ mvn -DskipTests package
+[INFO] BUILD SUCCESS
+
+$ java -jar migration-demo-1.0.0.jar
+GET /summary
+{"author":"ankur","createdAt":"2026-01-02T03:04:05Z","id":1,"title":"Hello"}  -> HTTP 200
+GET /greetings/1
+{"id":1,"title":"Hello #1","createdAt":"2026-01-02T03:04:05Z","author":"ankur"}  -> HTTP 200
+GET /greetings/count
+{"timestamp":"2026-10-29T05:55:01.660Z","status":500,"error":"Internal Server Error","path":"/greetings/count"}  -> HTTP 500
+GET /aspect
+{"interceptions":1}  -> HTTP 200
+GET /gateway
+{"client":"DefaultRestClient"}  -> HTTP 200
+GET /actuator/metrics (first 60 chars)
+{"names":["application.ready.time","application.started.time
+GET /actuator/health   (groups and status only)
+  groups=['liveness', 'readiness'] status=UP components=['db', 'diskSpace', 'livenessState', 'ping', 'readinessState', 'ssl']
+GET /actuator/health/liveness
+  -> HTTP 200
+root cause of that 500 in the application log:
+  Table "GREETING" not found
+Flyway log lines at start-up: 0
+after 40 more requests, log directory holds:  1 app.log;  (app.log is 54188 bytes; limit set is logging.file.max-size=2KB or its 4.1 replacement)
@@ -0,0 +1,13 @@
+$ # s6 = s3 + spring-boot-properties-migrator (runtime scope)
+[INFO] BUILD SUCCESS
+app started
+$ grep -iE 'propert|logging.file|migrat' run.log   # what the migrator printed at start-up
+WARN 2635 --- [           main] o.s.b.c.p.m.PropertiesMigrationListener  : 
+he use of configuration keys that have been renamed was found in the environment:
+Property source 'Config resource 'class path resource [application.properties]' via location 'optional:classpath:/'':
+	Key: logging.file.max-history
+		Replacement: logging.logback.rollingpolicy.max-history
+	Key: logging.file.max-size
+		Replacement: logging.logback.rollingpolicy.max-file-size
+Each configuration key has been temporarily mapped to its replacement for your convenience. To silence this warning, please update your configuration to use the new keys.
+(lines matching: 3)
@@ -0,0 +1,23 @@
+$ mvn verify   # after/ : Boot 4.1.2, one starter per technology, -test companions, Jackson 3, new packages
+CSRFPROBE status=403
+[INFO] Tests run: 8, Failures: 0, Errors: 0, Skipped: 0
+[INFO] BUILD SUCCESS
+
+$ java -jar migration-demo-1.0.0.jar
+GET /summary
+{"author":"ankur","createdAt":"2026-01-02T03:04:05Z","id":1,"title":"Hello"}  -> HTTP 200
+GET /greetings/1
+{"id":1,"title":"Hello #1","createdAt":"2026-01-02T03:04:05Z","author":"ankur"}  -> HTTP 200
+GET /greetings/count
+{"rows":3}  -> HTTP 200
+GET /aspect
+{"interceptions":1}  -> HTTP 200
+GET /gateway
+{"client":"DefaultRestClient"}  -> HTTP 200
+GET /actuator/metrics (first 60 chars)
+{"names":["application.ready.time","application.started.time
+GET /actuator/health   (groups and status only)
+  groups=['liveness', 'readiness'] status=UP components=['db', 'diskSpace', 'livenessState', 'ping', 'readinessState', 'ssl']
+GET /actuator/health/liveness
+  -> HTTP 200
+after 40 more requests, log directory holds:  1 app.log; 5 app.log.<date>.<n>.gz;  (app.log is 513 bytes; limit set is logging.file.max-size=2KB or its 4.1 replacement)
@@ -0,0 +1,4 @@
+# GET /summary on the same bean (id, title, createdAt, author declared in that order)
+Boot 3.5.16 (Jackson 2):                          {"id":1,"title":"Hello","createdAt":"2026-01-02T03:04:05Z","author":"ankur"}  -> HTTP 200
+Boot 4.1.2 (Jackson 3, defaults):                {"author":"ankur","createdAt":"2026-01-02T03:04:05Z","id":1,"title":"Hello"}  -> HTTP 200
+Boot 4.1.2 + spring.jackson.use-jackson2-defaults: {"id":1,"title":"Hello","createdAt":"2026-01-02T03:04:05Z","author":"ankur"}  -> HTTP 200
@@ -0,0 +1,6 @@
+$ mvn test-compile   # after/ pom and main code, but the Boot 3 GreetingControllerTest (@MockBean, old @AutoConfigureMockMvc package)
+t1/src/test/java/com/ankurm/migration/GreetingControllerTest.java:[10,63] package org.springframework.boot.test.autoconfigure.web.servlet does not exist
+t1/src/test/java/com/ankurm/migration/GreetingControllerTest.java:[12,50] package org.springframework.boot.test.mock.mockito does not exist
+t1/src/test/java/com/ankurm/migration/GreetingControllerTest.java:[16,2] cannot find symbol
+t1/src/test/java/com/ankurm/migration/GreetingControllerTest.java:[20,6] cannot find symbol
+[INFO] BUILD FAILURE
@@ -0,0 +1,5 @@
+$ mvn test   # after/ pom and main code + the Boot 3 MockFieldTest unchanged (compiles) and CsrfProbeTest (one import fixed)
+CSRFPROBE status=403
+[ERROR]   MockFieldTest.mockFieldIsInitialised:20 @Mock field was never initialised ==> expected: not <null>
+[ERROR] Tests run: 2, Failures: 1, Errors: 0, Skipped: 0
+[INFO] BUILD FAILURE
@@ -0,0 +1,8 @@
+$ javac SecurityConfig.java   # Boot 3 file, import repointed to the 4.1.2 package; the old method-chaining DSL left as it was
+SecurityConfig.java:16: error: method authorizeHttpRequests in class HttpSecurity cannot be applied to given types;
+        http.authorizeHttpRequests()
+            ^
+  required: Customizer<AuthorizeHttpRequestsConfigurer<HttpSecurity>.AuthorizationManagerRequestMatcherRegistry>
+  found:    no arguments
+  reason: actual and formal argument lists differ in length
+1 error