打破 LLM 黑盒：JProfiler 中的自定义分类
现代智能体应用常常通过单一接口执行各种各样的逻辑任务。尽管这些操作的性能和成本特征千差万别，但在传统性能分析器中，它们却只显示为一棵无差别的调用树。
默认情况下，JProfiler 按模型名称对这些请求进行分组，这虽然提供了高层次的概览，却缺乏区分不同功能工作负载所需的粒度。
本演示视频展示了如何借助脚本突破这一预定义的视角，根据内部元数据、指令结构或应用程序状态来定义您自己的分类规则。
AI 剖析：LangChain4j 与 Spring AI
智能体（agentic）应用带来了独特的剖析挑战。除了标准的 CPU 使用率之外，性能和成本还取决于提示词、RAG 检索器和工具调用所构成的复杂结构，而这些结构往往隐藏在框架抽象之下。
为了避免厂商锁定，大多数开发者都会使用 LangChain4j 或 Spring AI 这样的框架。JProfiler 的 AI 探针可让您深入了解这些框架。
这段录屏视频逐步演示了如何剖析一个 LangChain4j 客户支持智能体，展示了 AI 探针如何将提示词的构成可视化、隔离出 token 消耗高的异常调用，并将资源成本直接投射到所记录的调用树上。
Heap Walker scripting for snapshot analysis
Previously, JProfiler's heap walker only offered advanced filtering and grouping features in live sessions. With JProfiler 15, the heap walker introduces full support for filtering and grouping in snapshots. A new API lets you write scripts to filter objects or define custom grouping logic based on dumped object data.
This screencast demonstrates the new functionality with a small Hibernate-based demo that creates different types of query cache entries. Hibernate’s second-level cache can quickly fill up with unexpected entries, and identifying what’s taking up space is key to resolving memory issues. JProfiler now makes it possible to answer such questions with snapshots.
The screencast shows how you can:
- Group cache keys by query structure to compare memory impact
- Use object set filter scripts to isolate problematic cache entries
- Use merged dominating references to understand why objects are retained
Capturing and comparing MBean states with JProfiler
MBeans expose a wide range of runtime metrics and management operations that are essential for understanding the internal state of Java applications. Traditionally, JProfiler has supported live inspection of MBeans during a profiling session.
With the new MBean snapshot feature in JProfiler 15, it is now possible to capture the complete MBean state, compare snapshots, and analyze metrics offline, even after the application has shut down.
This screencast demonstrates the new functionality with a small Hazelcast application that performs random map operations and registers a custom MBean for triggering cleanup operations.
Along the way, you will see how to:
- Capture and compare MBean snapshots manually
- Trigger MBean snapshots programmatically with method triggers
- Restrict the snapshot scope to specific MBeans
Advanced SSH remote profiling with JProfiler
Remote profiling can be challenging when SSH access involves custom setups, proxies, or cloud authentication plugins. JProfiler 15 introduces advanced SSH connection features that remove these obstacles, enabling profiling in complex environments without manual setup.
This screen cast shows how to profile remote JVMs even in situations where the built-in SSH client is insufficient, using AWS Session Manager as an example.
Along the way, you will see how to:
- Use OpenSSH mode for remote profiling
- Connect with ProxyCommand and the AWS CLI
- Handle SSH port forwarding restrictions with netcat mode
Profiling Java applications in VS Code with JProfiler
JProfiler now integrates directly into VS Code, bringing the powerful profiling tool into your everyday development workflow.
In this screencast, we profile the Spring Pet Clinic demo and walk through the features of the JProfiler extension for VS Code, including:
- Toggling profiling mode
- Automatic setup of profiled packages
- Source code navigation from profiling views
- Attach mode for unsupported launch methods (like Maven)
- Built-in Gradle integration
If you're using a launch method in VS Code that isn't currently supported, let us know, we’re always looking to expand support.
Advanced Kafka probe configuration in JProfiler
In our first Kafka screencast, we looked at how JProfiler correlates message flow and CPU usage through producers, consumers, and topic-level call trees.
In this follow-up, we go deeper, showing how to configure custom naming for Kafka messages based on their content.
This enables you to:
- split call trees by semantic message types
- track specific event types in probe views
- add value-level details to single event descriptions
- visualize outliers in event duration histograms
We also trigger a Kafka message spike via an API call and analyze its impact, all without changing the application code.
Profiling Kafka #1 – Message Flow & Hot Spots
Kafka-based applications are notoriously hard to profile. Message flow happens in background threads, stack traces don’t reveal the full picture, and it’s hard to know which topic contributes to which hot spot.
JProfiler’s Kafka probes give you deep insight: producers, consumers, and message-level details are all captured and correlated with performance data.
This screencast walks through profiling a Spring Kafka application, showing how:
- consumer call trees are split by topic
- producers link directly into probe views
- you can correlate CPU hot spots with Kafka topics
- Kafka events are filterable, inspectable, and aggregatable
Garbage collector analysis in JProfiler
This screencast shows how to use the garbage collector probe in JProfiler. Having access to detailed information about the overall activity of the GC, as well as the single garbage collections, is crucial for tuning the garbage collector and achieving an optimal performance for your application.
Recording JFR snapshots with JProfiler
Recording JFR snapshots with JProfiler
This screencast shows JProfiler's versatile functionality as a JFR recording controller. As an example, a JFR recording on a Kubernetes cluster is recorded and the resulting snapshot is shown in JProfiler. In this context, you can see the wizard for configuring JFR recording settings. In addition, JFR recordings of terminated JVMs and the handling of externally started JFR recordings are demonstrated.