JMeter点击Dummy Sampler报尺寸过大IllegalArgumentException错误如何解决

问题根因 #

该报错和你配置的JVM Xmx（堆内存）、Xss（栈内存）参数无关，属于macOS系统下JMeter GUI的外观渲染bug：你在Dummy Sampler中配置的220KB JSON响应展开后行数极多，macOS默认的Aqua外观主题在渲染响应文本展示面板时，计算得到的文本渲染图像尺寸超出了AWT组件支持的最大阈值，进而触发崩溃。
完整报错信息如下：

2021-10-25 16:04:02,779 ERROR o.a.j.JMeter: Uncaught exception in thread Thread[AWT-EventQueue-0,6,main]
java.lang.IllegalArgumentException: Dimensions (width=27118 height=6346092) are too large
    at java.awt.image.SampleModel.<init>(SampleModel.java:130) ~[?:?]
    at java.awt.image.SinglePixelPackedSampleModel.<init>(SinglePixelPackedSampleModel.java:144) ~[?:?]
    at java.awt.image.Raster.createPackedRaster(Raster.java:798) ~[?:?]
    at java.awt.image.Raster.createPackedRaster(Raster.java:475) ~[?:?]
    at java.awt.image.DirectColorModel.createCompatibleWritableRaster(DirectColorModel.java:1032) ~[?:?]
    at java.awt.image.BufferedImage.<init>(BufferedImage.java:351) ~[?:?]
    at com.apple.laf.AquaPainter$AquaSingleImagePainter.createImage(AquaPainter.java:193) ~[?:?]
    at com.apple.laf.AquaPainter$AquaSingleImagePainter.lambda$paintFromSingleCachedImage$0(AquaPainter.java:178) ~[?:?]
    at sun.awt.image.MultiResolutionCachedImage.getResolutionVariant(MultiResolutionCachedImage.java:84) ~[?:?]
    at sun.java2d.SunGraphics2D.getResolutionVariant(SunGraphics2D.java:3310) ~[?:?]
    at sun.java2d.SunGraphics2D.drawHiDPIImage(SunGraphics2D.java:3138) ~[?:?]
    at sun.java2d.SunGraphics2D.drawImage(SunGraphics2D.java:3376) ~[?:?]
    at sun.java2d.SunGraphics2D.drawImage(SunGraphics2D.java:3326) ~[?:?]

解决方案 #

• 切换JMeter外观主题：打开JMeter → 顶部菜单栏「选项」→「外观」，选择除「Mac OS X」/「Aqua」之外的任意主题（如Metal、Darcula），重启JMeter后生效。
• 优化超长响应配置：无需在Dummy Sampler中直接填写完整JSON内容，改用${__FileToString(your_response.json,,)}函数读取本地存储的220KB JSON文件，既可以保留真实响应体积，又不会在GUI点击Sampler时加载全量文本触发渲染崩溃。
• 升级JMeter版本：该渲染bug在JMeter 5.4.2及更高版本已完成适配修复，升级到最新稳定版即可解决问题。

内容的提问来源于stack exchange，提问作者pratik