Java中图片合成视频实现及报错求助

Hey George, let's break down what's causing this error and how to fix it quickly.

What's the Root Cause? #

Looking at your stack trace, the core issue is clear:

Caused by: java.lang.RuntimeException: Uncompilable source code - cannot find symbol 
symbol: class Nullable 
location: package javax.annotation

The JCodec library (which you're using via AWTSequenceEncoder) relies on the javax.annotation.Nullable annotation, but this class isn't included in modern JDKs (Java 8+ removed most Java EE modules from the default classpath). That's why your code can't find the symbol during compilation.

Step-by-Step Fixes #

1. Add the Missing Dependency

You need to include the javax.annotation-api library in your project to provide the missing Nullable class.

• If using Maven: Add this to your pom.xml:

  <dependency>
      <groupId>javax.annotation</groupId>
      <artifactId>javax.annotation-api</artifactId>
      <version>1.3.2</version>
  </dependency>
  

• If using Gradle: Add this to your build.gradle:

  implementation 'javax.annotation:javax.annotation-api:1.3.2'
  

• If manually managing JARs: Download the javax.annotation-api-1.3.2.jar and add it to your project's classpath.

2. Double-Check Your JDK Version

If you're using Java 9 or later, you don't need any extra module configuration—adding the dependency above will handle it, since the JAR is fully compatible with modular JDKs.

Quick Note on Your Screen Capture Code #

While we're at it, I noticed a small detail in your Rectangle initialization:

Rectangle screenRect= new Rectangle(300,400);

The two-parameter Rectangle constructor sets width and height (starting at x=0, y=0). If you meant to capture a region starting at the (300, 400) coordinate on your screen, you should use the four-parameter version instead:

// Example: Capture an 800px wide, 600px tall area starting at (300,400)
Rectangle screenRect = new Rectangle(300, 400, 800, 600);

Just a heads-up to make sure you're capturing the exact screen area you want!

内容的提问来源于stack exchange，提问作者George