Claude
d6a2e1a5f2
Co-Authored-By: Claude Sonnet 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01Uu7q8vPeREyT4218EJPzz1
50 lines
2.8 KiB
Bash
Executable File
50 lines
2.8 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Two facts about the circular-reference machinery, read out of the Framework and Boot jars rather than from docs:
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# 36 the defaults of spring.main.allow-circular-references and spring.main.lazy-initialization
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# 37 which post-processors supply an early reference, and the exception handler in preInstantiateSingleton
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set -euo pipefail
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cd "$(dirname "$0")/.."
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mkdir -p output
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M2=~/.m2/repository/org/springframework
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BOOT=$M2/boot/spring-boot/4.1.1/spring-boot-4.1.1.jar
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AOP=$M2/spring-aop/7.0.9/spring-aop-7.0.9.jar
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CTX=$M2/spring-context/7.0.9/spring-context-7.0.9.jar
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BEANS=$M2/spring-beans/7.0.9/spring-beans-7.0.9.jar
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JP() { javap "$@" 2>&1 | grep -v '^Picked up'; }
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{
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echo "# Defaults read from spring-configuration-metadata.json in spring-boot-4.1.1.jar"
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echo
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unzip -p "$BOOT" META-INF/spring-configuration-metadata.json | python3 -c '
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import json,sys
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d=json.load(sys.stdin)
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for p in d["properties"]:
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if p["name"] in ("spring.main.allow-circular-references","spring.main.lazy-initialization"):
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print("%-40s default=%s" % (p["name"], p.get("defaultValue")))
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'
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} > output/36-main-property-defaults.txt
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{
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echo "# Who hands out an early reference, and the handler in preInstantiateSingleton (Spring Framework 7.0.9 jars)"
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echo
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echo "--- the class that draws the report, in spring-boot-4.1.1.jar ---"
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unzip -l "$BOOT" | awk '/BeanCurrentlyInCreationFailureAnalyzer/ {print $4}'
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echo
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echo "--- AbstractAutoProxyCreator (spring-aop): declared methods that mention 'early' ---"
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JP -p -cp "$AOP" org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator | grep -i early | sed 's/^ *//'
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echo
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echo "--- AbstractAdvisingBeanPostProcessor (spring-aop): declared members that mention 'early' ---"
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n=$(JP -p -cp "$AOP" org.springframework.aop.framework.AbstractAdvisingBeanPostProcessor | grep -ci early || true)
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echo "matches: $n"
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echo
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echo "--- the @Async post-processor's ancestry ---"
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JP -cp "$CTX:$AOP" org.springframework.scheduling.annotation.AsyncAnnotationBeanPostProcessor | grep -o 'class [^ ]* extends [^ ]*'
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JP -cp "$AOP" org.springframework.aop.framework.autoproxy.AbstractBeanFactoryAwareAdvisingPostProcessor | grep -o 'class [^ ]* extends [^ ]*'
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echo
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echo "--- DefaultListableBeanFactory.preInstantiateSingleton(String, RootBeanDefinition): exception table ---"
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JP -p -c -cp "$BEANS" org.springframework.beans.factory.support.DefaultListableBeanFactory \
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| awk '/private java.util.concurrent.CompletableFuture<\?> preInstantiateSingleton\(/ {f=1} f&&/Exception table:/ {t=1} t {print} t&&/^ private void instantiateSingletonInBackgroundThread/ {exit}' \
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| grep -v 'instantiateSingletonInBackgroundThread' | sed 's/^ *//'
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} > output/37-early-reference-bytecode.txt
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cat output/36-main-property-defaults.txt output/37-early-reference-bytecode.txt
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