@jamezp I have tried this in local and it seems to be fixing the blocking execution in the reactor flow. WDYT about this?

@radhakrishnan10192 What does the issue seem to be? I see from the JIRA that it's blocking, but I'm not following why that would be an issue.

@jamezp When http write operation is performed from 6.2.11 version, default object mapper is initialised using ObjectMapper.findAndRegisterModules() which does classpath scanning via ServiceLoader. This opens JARs and reads their contents. That’s blocking I/O, and when it happens on a non‑blocking/reactor thread during a RESTEasy write, BlockHound flags it (your stack shows RandomAccessFile → JarURLConnection → ServiceLoader).

here is a sample trace i have got

0 = {StackTraceElement@22552} "reactor.blockhound.BlockHound$Builder.lambda$new$0(BlockHound.java:258)" 1 = {StackTraceElement@22560} "reactor.blockhound.BlockHound$Builder.lambda$install$8(BlockHound.java:488)" 2 = {StackTraceElement@22561} "reactor.blockhound.BlockHoundRuntime.checkBlocking(BlockHoundRuntime.java:89)" 3 = {StackTraceElement@22562} "java.base/java.io.RandomAccessFile.readBytes(RandomAccessFile.java)" 4 = {StackTraceElement@22563} "java.base/java.io.RandomAccessFile.read(RandomAccessFile.java:405)" 5 = {StackTraceElement@22564} "java.base/java.io.RandomAccessFile.readFully(RandomAccessFile.java:469)" 6 = {StackTraceElement@22565} "java.base/java.util.zip.ZipFile$Source.readFullyAt(ZipFile.java:1478)" 7 = {StackTraceElement@22566} "java.base/java.util.zip.ZipFile$ZipFileInputStream.initDataOffset(ZipFile.java:922)" 8 = {StackTraceElement@22567} "java.base/java.util.zip.ZipFile$ZipFileInputStream.read(ZipFile.java:938)" 9 = {StackTraceElement@22568} "java.base/java.util.zip.ZipFile$ZipFileInflaterInputStream.fill(ZipFile.java:455)" 10 = {StackTraceElement@22569} "java.base/java.util.zip.InflaterInputStream.read(InflaterInputStream.java:158)" 11 = {StackTraceElement@22570} "java.base/java.io.InputStream.readNBytes(InputStream.java:506)" 12 = {StackTraceElement@22571} "java.base/java.util.jar.JarFile.getBytes(JarFile.java:814)" 13 = {StackTraceElement@22572} "java.base/java.util.jar.JarFile.checkForSpecialAttributes(JarFile.java:1004)" 14 = {StackTraceElement@22573} "java.base/java.util.jar.JarFile.isMultiRelease(JarFile.java:388)" 15 = {StackTraceElement@22574} "java.base/java.util.jar.JarFile.getEntry(JarFile.java:510)" 16 = {StackTraceElement@22575} "java.base/sun.net.www.protocol.jar.URLJarFile.getEntry(URLJarFile.java:131)" 17 = {StackTraceElement@22576} "java.base/sun.net.www.protocol.jar.JarURLConnection.connect(JarURLConnection.java:135)" 18 = {StackTraceElement@22577} "java.base/sun.net.www.protocol.jar.JarURLConnection.getInputStream(JarURLConnection.java:175)" 19 = {StackTraceElement@22578} "java.base/java.util.ServiceLoader$LazyClassPathLookupIterator.parse(ServiceLoader.java:1172)" 20 = {StackTraceElement@22579} "java.base/java.util.ServiceLoader$LazyClassPathLookupIterator.nextProviderClass(ServiceLoader.java:1213)" 21 = {StackTraceElement@22580} "java.base/java.util.ServiceLoader$LazyClassPathLookupIterator.hasNextService(ServiceLoader.java:1228)" 22 = {StackTraceElement@22581} "java.base/java.util.ServiceLoader$LazyClassPathLookupIterator.hasNext(ServiceLoader.java:1273)" 23 = {StackTraceElement@22582} "java.base/java.util.ServiceLoader$2.hasNext(ServiceLoader.java:1309)" 24 = {StackTraceElement@22583} "java.base/java.util.ServiceLoader$3.hasNext(ServiceLoader.java:1393)" 25 = {StackTraceElement@22584} "com.fasterxml.jackson.databind.ObjectMapper.findModules(ObjectMapper.java:1161)" 26 = {StackTraceElement@22585} "com.fasterxml.jackson.databind.ObjectMapper.findModules(ObjectMapper.java:1145)" 27 = {StackTraceElement@22586} "com.fasterxml.jackson.databind.ObjectMapper.findAndRegisterModules(ObjectMapper.java:1195)" 28 = {StackTraceElement@22587} "org.jboss.resteasy.plugins.providers.jackson.ResteasyJackson2Provider._locateMapperViaProvider(ResteasyJackson2Provider.java:366)" 29 = {StackTraceElement@22588} "com.fasterxml.jackson.jakarta.rs.base.ProviderBase.locateMapper(ProviderBase.java:900)" 30 = {StackTraceElement@22589} "org.jboss.resteasy.plugins.providers.jackson.ResteasyJackson2Provider.writeTo(ResteasyJackson2Provider.java:226)"