<div dir="ltr">Hello,<div><br></div><div>I am using this method to measure object size in Java:</div><div><a href="https://stackoverflow.com/a/52682/147530">https://stackoverflow.com/a/52682/147530</a><br></div><div>and it was (it still does) working with JDK17 on a x64 Intel based Mac. But today I tried it with JDK20 on a AARch64 based Mac and it does not work. I get runtime exception:</div><div><a href="https://stackoverflow.com/questions/77055455/java-lang-nullpointerexception-cannot-invoke-java-lang-instrument-instrumentat/77055526#77055526">https://stackoverflow.com/questions/77055455/java-lang-nullpointerexception-cannot-invoke-java-lang-instrument-instrumentat/77055526#77055526</a><br></div><div><pre class="gmail-lang-java gmail-s-code-block" style="margin-top:0px;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-variant-alternates:inherit;font-stretch:inherit;font-kerning:inherit;font-feature-settings:inherit;vertical-align:baseline;box-sizing:inherit;width:auto;max-height:600px;overflow:auto"><code class="gmail-hljs gmail-language-java" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-stretch:inherit;line-height:inherit;font-family:inherit;font-kerning:inherit;font-feature-settings:inherit;vertical-align:baseline;box-sizing:inherit;background-color:transparent;white-space:inherit">java.lang.NullPointerException: Cannot invoke <span class="gmail-hljs-string" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-stretch:inherit;line-height:inherit;font-family:inherit;font-kerning:inherit;font-feature-settings:inherit;font-size:13px;vertical-align:baseline;box-sizing:inherit">"java.lang.instrument.Instrumentation.getObjectSize(Object)"</span> because <span class="gmail-hljs-string" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-stretch:inherit;line-height:inherit;font-family:inherit;font-kerning:inherit;font-feature-settings:inherit;font-size:13px;vertical-align:baseline;box-sizing:inherit">"com.github.jelmerk.ObjectSizeFetcher.instrumentation"</span> is <span class="gmail-hljs-literal" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-stretch:inherit;line-height:inherit;font-family:inherit;font-kerning:inherit;font-feature-settings:inherit;font-size:13px;vertical-align:baseline;box-sizing:inherit">null</span>
    at com.github.jelmerk.ObjectSizeFetcher.getObjectSize (ObjectSizeFetcher.java:<span class="gmail-hljs-number" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-stretch:inherit;line-height:inherit;font-family:inherit;font-kerning:inherit;font-feature-settings:inherit;font-size:13px;vertical-align:baseline;box-sizing:inherit">18</span>)
    at com.mycompany.app.App.main (App.java:<span class="gmail-hljs-number" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-stretch:inherit;line-height:inherit;font-family:inherit;font-kerning:inherit;font-feature-settings:inherit;font-size:13px;vertical-align:baseline;box-sizing:inherit">48</span>)
    at org.codehaus.mojo.exec.ExecJavaMojo$<span class="gmail-hljs-number" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-stretch:inherit;line-height:inherit;font-family:inherit;font-kerning:inherit;font-feature-settings:inherit;font-size:13px;vertical-align:baseline;box-sizing:inherit">1.</span>run (ExecJavaMojo.java:<span class="gmail-hljs-number" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-stretch:inherit;line-height:inherit;font-family:inherit;font-kerning:inherit;font-feature-settings:inherit;font-size:13px;vertical-align:baseline;box-sizing:inherit">279</span>)
    at java.lang.Thread.run (Thread.java:<span class="gmail-hljs-number" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-stretch:inherit;line-height:inherit;font-family:inherit;font-kerning:inherit;font-feature-settings:inherit;font-size:13px;vertical-align:baseline;box-sizing:inherit">1623</span>)</code></pre></div><div>any idea how I can fix this? thanks,</div><div><br></div><div>S.</div></div>