Gesamtübersicht

Migrationsmatrix

Einheitliche Sicht auf Zielbild, Risiko und Testschwerpunkt aller Module.

Modul	Kategorie	Stufe	Risiko	Technischer Übergang	Hauptrisiko	Testschwerpunkt
01 · Dependency Injection	Enterprise	1	NIEDRIG	Service Locator / manuelle Verdrahtung → Spring Constructor Injection	hidden dependencies, global state	constructor-level unit tests and context smoke test
02 · AOP	Enterprise	3	NIEDRIG	JDK Dynamic Proxy → Spring AOP mit @Aspect	proxy limitations and cross-cutting coupling	aspect activation, exception and ordering tests
03 · REST	Integration	3	NIEDRIG	JAX-RS 2.1 mit javax.ws.rs → Spring Boot REST mit jakarta.validation	HTTP contract drift and validation gaps	status codes, validation, error payload and actuator exposure
04 · Persistenz	Daten	4	NIEDRIG	JDBC und DAO → Spring Data JPA	schema drift, lazy loading and transaction boundaries	repository slice, service transaction and rollback tests
05 · Transaktionen	Daten	4	NIEDRIG	manuelles Commit/Rollback → @Transactional	partial writes and incorrect rollback rules	success, checked/unchecked failure and rollback assertions
06 · Batch	Integration	5	MITTEL	manueller CSV-Ablauf → Spring Batch Pipeline	restartability, duplicate processing and bad-record policy	job launch, restart, skip/retry and idempotency tests
07 · Messaging	Integration	5	MITTEL	javax.jms und ActiveMQ Classic → Spring JMS mit jakarta.jms	duplicate delivery, poison messages and vulnerable legacy broker	redelivery, idempotency, DLQ and serialization tests
08 · XML und JAXB	XML	3	NIEDRIG	javax.xml.bind → jakarta.xml.bind	namespace and schema compatibility	round-trip, invalid XML, encoding and XXE-negative tests
09 · Servlet und Web	Web	3	NIEDRIG	javax.servlet → Spring MVC auf jakarta.servlet	container/API migration and endpoint compatibility	web slice, content type, health and malformed request tests
10 · SOAP	Integration	3	MITTEL	javax JAX-WS → Jakarta XML Web Services	WSDL/namespace compatibility and fault mapping	contract, SOAP fault and interoperability tests
11 · Java-Grundlagen	Java Core	2	NIEDRIG	mutable JavaBean und Hilfsklassen → Records, Pattern Matching und Value Objects	serialization/equality behavior changes	equals/hashCode, validation and immutability tests
12 · Collections	Java Core	2	NIEDRIG	Vector, Hashtable und Enumeration → generische Collections und unveränderliche Sichten	mutation leaks and ordering semantics	aliasing, null, duplicates and ordering tests
13 · Generics	Java Core	2	NIEDRIG	Raw Types und Casts → typsichere generische Repositorys	runtime ClassCastException versus compile-time safety	generic boundaries, absent values and repository identity tests
14 · Annotations und Reflection	Java Core	2	NIEDRIG	Namenskonventionen und Reflection-Strings → Annotation-gesteuertes Command Registry	illegal access, duplicate commands and startup failures	duplicate annotation, missing method and invocation failure tests
15 · Lambda und Streams	Java Core	2	NIEDRIG	imperative Schleifen und anonyme Klassen → Stream Pipeline mit Records und Collectors	ordering, short-circuit and null semantics	empty input, duplicates, precision and parallel-safety tests
16 · Concurrency	Java Core	2	NIEDRIG	plattformgebundener Thread Pool → Virtual Threads und sichere Aggregation	race conditions, leaks and nondeterministic tests	timeouts, cancellation, interruption and repeated stress tests
17 · Java I/O und NIO	Java Core	2	NIEDRIG	File und manuelles Ressourcenmanagement → Path, Files und Try-with-resources	resource handling, overwrite and atomicity	permissions, missing files, overwrite and large-file tests
18 · Exception Handling und Logging	Java Core	1	NIEDRIG	Catch-all, null und System.err → Domain Exceptions und System.Logger	lost root cause and unstable error contracts	cause preservation, log context and negative-path tests
19 · JUnit und Testdesign	Testing	1	NIEDRIG	JUnit 4 und einzelne Beispielwerte → JUnit 5 Parameterized Tests	test lifecycle and assertion migration	parameter boundaries, lifecycle and failure-message tests
20 · HTTP-Client und Webtest	Testing	2	NIEDRIG	HttpURLConnection → Java HttpClient mit Transport-Port	timeouts, redirects and encoding	timeout, non-2xx, headers, redirect and body-size tests
21 · Maven Properties und Konfiguration	Build	1	NIEDRIG	String-Properties und Build-Filterung → typisierte Konfiguration mit Validierung	missing keys, precedence and environment drift	default, override, malformed and encoding tests
22 · Spring JDBC	Daten	4	NIEDRIG	Statement, ResultSet und manuelles Mapping → JdbcClient und RowMapper	SQL mapping, transaction and resource handling	row mapping, empty result, duplicate key and rollback tests
23 · Hibernate und JPA	Daten	4	NIEDRIG	proprietäres Hibernate Session API → Jakarta Persistence und Spring Data Repository	entity lifecycle, schema and query differences	entity mapping, repository query, transaction and N+1 checks
24 · MongoDB	Daten	4	NIEDRIG	MongoDB Document und manueller Mapper → Spring Data MongoDB Document/Repository	document shape and mapping compatibility	mapping, missing fields, query and index assumptions
25 · JNDI und Service-Auflösung	Enterprise	5	NIEDRIG	InitialContext und Service Locator → Constructor Injection und explizite Ports	runtime lookup failure and hidden dependency	binding failure, constructor contract and context startup
26 · JMX und Monitoring	Observability	5	NIEDRIG	Standard MBean und direkte Registrierung → Actuator und Micrometer Counter	metric/endpoint naming and exposure	endpoint exposure, health detail and unauthorized access tests
27 · EJB und Services	Enterprise	5	NIEDRIG	EJB-2-artige Home/Remote-Schnittstellen → Spring Service und REST Facade	transaction/security semantics and remote contract drift	service contract, web adapter and transaction tests
28 · JPMS / Jigsaw	Modularisierung	5	MITTEL	Classpath und globale Sichtbarkeit → module-info, exports und Service Provider	split packages, exports and readability	module-path compile, forbidden access and service-loading tests
29 · Service Registry und ServiceLoader	Modularisierung	5	NIEDRIG	dynamische Service Registry → Java SPI mit ServiceLoader	provider discovery, ordering and duplicates	no provider, multiple provider and packaging tests
30 · XML Parser	XML	3	NIEDRIG	DOM lädt vollständigen Objektbaum → StAX verarbeitet Streaming-Events	XXE, entity expansion and malformed XML	XXE-negative, namespace, large input and error-position tests
31 · XSLT	XML	3	NIEDRIG	Transformer pro Aufruf mit Defaults → vorkompilierte Templates mit Secure Processing	external access, thread safety and cache invalidation	external resource denial, concurrency and invalid stylesheet tests
32 · Kryptografie	Security	5	NIEDRIG	deterministische AES-ECB-Demo → AES-GCM mit PBKDF2, Salt und IV	confidentiality/integrity failure and nonce misuse	tamper, wrong key, nonce uniqueness and empty payload tests
33 · SMTP und Mail	Integration	3	NIEDRIG	javax.mail MimeMessage → Jakarta Mail und Mail Gateway	header injection, transport errors and charset drift	recipient validation, Unicode, transport failure and header tests
34 · Patterns und Refactoring	Architecture	1	NIEDRIG	Switch-basierte Preislogik → Strategy, Factory und Value Objects	branch growth and unsupported customer types	all strategies, factory completeness and unknown type tests