Graph/6d974914-8453-4190-aba9-da0ab4daa3d7

Domainunvalidated

Class Loading

6d974914-8453-4190-aba9-da0ab4daa3d7

Class Loading

Node Details

Public graph metadata

Updated4/30/2026

PageRank0.0003

Effectiveness0.000

Connections

50 linked nodes

RELATES_TOComponent

spring boot

PERTAIN_TORootCause

Class org.apache.hadoop.fs.s3a.S3AFileSystem not found — moving plugin jar to `/opt/flink/plugins/s3-fs-hadoop/` in my Dockerfile. Tension: it is redundancy and should work without it ? Outcome: plugin is in the right folder.

PERTAIN_TOProblem

Caused by: java.lang.ClassNotFoundException: Class org.apache.hadoop.fs.s3a.S3AFileSystem not found — when I'm running my pod. Outcome: When I add "hadoop-aws" dependency it works.

PERTAIN_TOSolution

Flink provides built-in support for several of the supported filesystem plugins like AWS, S3, Azure, etc. via the `ENABLE_BUILT_IN_PLUGINS` environment variable — containers: - name: flink-main-container. Tension: These can vary depending on what specifically you need to target. Outcome: value: flink-s3-fs-hadoop-1.18.1.jar.

PERTAIN_TOProblem

Delegation token provider with service name s3-hadoop has multiple implementations

PERTAIN_TOSolution

Use Flink FileSystem and/or flink FileSource.forRecordStreamFormat(...) to read on s3

PERTAIN_TOSolution

Use either Dockerfile plugin installation or ENABLE_BUILT_IN_PLUGINS, but do not mix both

PERTAIN_TOSolution

I used the env option listed at https://chetnachaudhari.github.io/2016-02-16/how-to-add-auxiliary-jars-in-hive/ — I'm using the official Apache Hive HMS image. Tension: I get a org.apache.hadoop.fs.s3a.S3AFileSystem not found message when trying to write a hudi table into S3. Outcome: I used the env option listed at https://chetnachaudhari.github.io/2016-02-16/how-to-add-auxiliary-jars-in-hive/.

PERTAIN_TOProblem

Spring Boot is not resolving the Secret Manager reference in application.yaml/bootstrap.yml and instead returns the raw value string (projects/my-project/secrets/password/versions/1) for the datasource password.

PERTAIN_TOSolution

Spring context. Tension: The datasource configuration should be injected into the Spring context. Outcome: registry.add("spring.datasource.url", postgreSQLContainer ::getJdbcUrl); registry.add("spring.datasource.username", postgreSQLContainer ::getUsername); registry.add("spring.datasource.password", postgreSQLContainer ::getPassword);.

PERTAIN_TOProblem

Parameter 0 of method securityFilterChain required a bean of type 'org.springframework.security.' that could not be found — I am using spring boot microservice (spring boot version -3). Tension: Its on Gateway server.

PERTAIN_TOProblem

It looks like Spring Cloud GCP is calling a method that no longer exists in Spring Boot 4. — Spring Cloud GCP 7.x compatible with Spring Boot 4.0.0. Tension: Spring Cloud GCP 7.x supports Spring Boot 3.x only. Outcome: Technically, it's impossible because Spring Cloud GCP 7.x supports Spring Boot 3.x only.

PERTAIN_TOSolution

But you can try this workaround solution to see if this works: — spring-cloud-gcp-starter-secretmanager 7.3.2. Tension: enforce Spring Cloud GCP 7.x to use Spring Cloud Context 5.0.0. Outcome: which uses Spring Boot 4.0.0 starters.

PERTAIN_TOProblem

how do you do both at the same time? — JavaFX application. Tension: but the examples are basic... Outcome: it works for this case.

PERTAIN_TOProblem

The H2 database web console cannot be opened in the browser when running the Spring Boot application from the tutorial.

PERTAIN_TOSolution

Replace spring-boot-starter-webmvc with spring-boot-starter-web to include an embedded server and make the H2 console accessible.

PERTAIN_TOSolution

What’s the correct way to bundle JavaFX dependencies into an executable `.jar` (or `.exe`) file — so that it runs on any system without requiring external JavaFX setup. Tension: the `.jar` fails to run independently. Outcome: Used IntelliJ’s “Build Artifacts → JAR → From modules with dependencies”.

PERTAIN_TOProblem

java.io.InvalidClassException: tls.other.app.package.SomeClass; local class incompatible: stream classdesc serialVersionUID = 1, local class serialVersionUID = 2 — deserializing the older streams. Tension: some (older) streams seem to have been serialized using classes with different serial version IDs. Outcome: I want to deserialize both versions of the Java object streams with the same application.

PERTAIN_TOSolution

Override `ObjectInputStream::readClassDescriptor` — read the stream using the first package. Tension: When that fails with the error message above I read the stream again changing the package / class name inside of readClassDescriptor().

PERTAIN_TOSolution

I created two packages with the same classes, just different serial version IDs. — older streams. Tension: When I change the serial version IDs in the existing classes I can deserialize the older streams, but of course the new ones are not working anymore. Outcome: Do the same thing but keep your version of the class in the same package as the real clas.

PERTAIN_TOProblem

Exception in thread "main" java.lang.IllegalStateException: java.lang.NoSuchMethodError: 'void org.springframework.data.jpa.repository.config.JpaRepositoryConfigExtension.registerLazyIfNotAlreadyRegistered. Tension: I am trying to do a sample microservice which involves pulling data from multiple databases.

PERTAIN_TOSolution

If you see 2 versions of JPA — Spring Boot 3.3.x pulling in Spring Data JPA 3.3.x but another library in your project bringing an older Spring Data JPA. Tension: then remove the older version. Outcome: remove the older version.

PERTAIN_TOProblem

All test fails with `NoSuchMethodError` — using embedded kafka from `org.springframework.kafka:spring-kafka-test:3.3.5` for testing purposes. Tension: that is thrown inside of `org.apache.kafka:kafka_2.13:3.8.1`. Outcome: Everything worked until I had to change version of `org.apache.kafka:kafka-clients` from `3.8.1` to `3.9.1`.

PERTAIN_TOSolution

i solved my occurrence by adding a test scope reference to the kafka server — for testing purposes.

PERTAIN_TOSolution

I managed to get it working — trying to update kafka-clients module to 3.9.1 on it's own. Outcome: by forcing all modules in group org.apache.kafka to 3.9.1 instead of just kafka-clients module on it's own.

PERTAIN_TORootCause

runtime-only dynamic dependencies — through reflection and the service provider model. Tension: that can resolve reflected runtime-only dynamic dependencies. Outcome: not looking for the jdeps command.

PERTAIN_TOProblem

What are ways to systematically find all modules of the JDK that will be/have been used during the runtime of a Java application through reflection and the service provider model? — through reflection and the service provider model. Tension: I am, to my understanding, not looking for the jdeps command unless someone has a particular set of arguments that can resolve reflected runtime-only dynamic dependencies. Outcome: I already understand there is the `jlinks --suggest-providers` option, but this requires knowledge of each provider that is lacking.

PERTAIN_TOSolution

For Java 21,. Tension: to show all modules attempted to be loaded. Outcome: Filter from there for Java packages as needed.

PERTAIN_TOProblem

no main manifest attribute, in GraphingCalculator-1.0-SNAPSHOT.jar — I then ran the jar using: `java -jar GraphingCalculator-1.0-SNAPSHOT.jar`.

PERTAIN_TORootCause

The restart class loader couldn't find the classes. — I was using spring-boot-devtools which has a restart function. Tension: The restart class loader couldn't find the classes. Outcome: Which threw a class loader exception.

PERTAIN_TOProblem

org.hibernate.query.QueryTypeMismatchException: Specified result type — I moved a Hibrenate implementation to another project. From com.mvc.data to com.mvc.frontend. Tension: Notice that it's the same type. Outcome: So the problem was that I was using spring-boot-devtools which has a restart function.

PERTAIN_TOSolution

Disabling the restart function didn't work for me — spring-boot-devtools which has a restart function. Tension: the restart class loader couldn't find the classes. Outcome: I simply removed devtools from Maven.

PERTAIN_TOProblem

Cannot run program "mvn": CreateProcess error=2, The system cannot find the file specified — ProcessBuilder processBuilder = new ProcessBuilder("mvn", "quarkus:dependency-tree");. Tension: results in.

PERTAIN_TOSolution

You need to do something like the following: — Class.forName("io.quarkus.info.BuildInfo", false, Thread.currentThread().getContextClassLoader());. Outcome: catch(ClassNotFoundException ignored) { return false; }.

PERTAIN_TOProblem

The dialect works perfectly fine in a local mode. — trying to get it registered in my Spark (v3.5.1) cluster. Tension: The Spark cluster also successfully retrieves data from DB whenever I execute queries that don't require dialect customizations. Outcome: It turned out, there were only 2 things that really mattered.

PERTAIN_TOSolution

The application JAR with the custom dialect had to be accessible for Spark workers. — Spark workers. Tension: The dialect registration had to occur on every worker.

PERTAIN_TOProblem

When running the packaged fat JAR with `java -jar`, Log4J fails to find/initialize its implementation (e.g., Log4j core), so logging does not work. The build produces a single JAR that should include all dependencies.

PERTAIN_TOSolution

Use a JAR-in-JAR packaging approach (e.g., Spring Boot’s `spring-boot-maven-plugin` with `repackage`) or another plugin that preserves/merges `META-INF/services/` so Log4j Core can be loaded correctly from the packaged dependencies.

PERTAIN_TOProblem

java -jar cannot find or load org.example.Main

PERTAIN_TOSolution

Configure the Shadow plugin, run shadowJar, and set the Main-Class manifest attribute in build.gradle

PERTAIN_TOProblem

either nothing happens or a "java exception has occured rip" error popup happens — When exporting the application from Eclipse as Runnable JAR, and doubleclicking the .jar. Tension: The only ways that successfully run the application aren't very end-user-friendly. Outcome: The goal is to fix.

PERTAIN_TOProblem

Could not find or load main class Caused by: java.lang.ClassNotFoundException with jpackage — trying to build a standalone kotlin - compose - spring app.

PERTAIN_TOSolution

Instead just ditch this restructuring of the Spring Boot `bootJar` task — you now have a jar which is executable (it contains a `MANIFEST.MF` with all the proper entries). Tension: This task is basically replacing what Spring Boot already does and in a bad way as well. Outcome: let it do its thing instead of trying to be smarter.

PERTAIN_TOProblem

Unable to get java.sql.Driver from DriverManager — When I try to initiate the database. Tension: I have written a Scala+AKKA api using Scala 3. Outcome: This fixed the above issue, so I'm marking this as resolved.

PERTAIN_TOSolution

This then allowed me to set my config like this: — The starter guide has references to `URL`, `USER` variables when setting the config. Tension: `URL`, `USER` and `PASS` are deprecated. Outcome: `import org.hibernate.cfg.JdbcSettings._`.

PERTAIN_TOProblem

SLF4J: No SLF4J providers were found. — When I run a simple main class with random log. Tension: Defaulting to no-operation (NOP) logger implementation. Outcome: logback-classic.jar is the slf4j provider not logback-core.jar.

PERTAIN_TOSolution

logback-classic.jar is the slf4j provider not logback-core.jar. — the class path of InterlliJ Idea that you provided. Tension: SLF4J can't see logback even if itself come from a logback dependency. Outcome: logback-classic.jar is the slf4j provider not logback-core.jar.

PERTAIN_TOProblem

Error: Could not find or load — java -jar RunnableJarBuilder.zip. Tension: When I compare the two files in Windows explorer they are identical. Outcome: it does not work.

PERTAIN_TOSolution

my code was using backslashes (`\`) as a path separator. Tension: the zip files using zipdump. Outcome: this was my non-working file:.

PERTAIN_TOProblem

then I get a pop-up window with the error inscribed and the text inside is `kg/apc/charting/DateTimeRenderer` — When I try to open the `.jmx` file. Tension: Plugins Manager were unable to find plugins to satisfy Test Plan requirements. Outcome: I have inherited a legacy load testing project.

[inerrata]Tags Knowledge Graph Docs About Team Pricing Contact Report a Bug Privacy Terms Cookie Settings Do Not Sell or Share My Info

Class Loading - inErrata Knowledge Graph | Inerrata