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https://issues.apache.org/jira/browse/HBASE-29768?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18044105#comment-18044105
]
Dávid Paksy commented on HBASE-29768:
-------------------------------------
Hi [~guluo],
I tried to reproduce the error you mention but I was not able to.
My config was according to [https://hbase.apache.org/book.html#bc.example]:
{noformat}
diff --git a/conf/hbase-env.sh b/conf/hbase-env.sh
index 73b7b72ea2f..9e0f611c904 100644
--- a/conf/hbase-env.sh
+++ b/conf/hbase-env.sh
@@ -31,7 +31,7 @@
# export HBASE_CLASSPATH=
# The maximum amount of heap to use. Default is left to JVM default.
-# export HBASE_HEAPSIZE=1G
+export HBASE_HEAPSIZE=5G
# Uncomment below if you intend to use off heap cache. For example, to
allocate 8G of
# offheap, set the value to "8G". See
http://hbase.apache.org/book.html#direct.memory
diff --git a/conf/hbase-site.xml b/conf/hbase-site.xml
index 48b78ec72d0..d0a43825b27 100644
--- a/conf/hbase-site.xml
+++ b/conf/hbase-site.xml
@@ -51,4 +51,16 @@
<name>hbase.unsafe.stream.capability.enforce</name>
<value>false</value>
</property>
+ <property>
+ <name>hbase.bucketcache.ioengine</name>
+ <value>offheap</value>
+ </property>
+ <property>
+ <name>hfile.block.cache.size</name>
+ <value>0.2</value>
+ </property>
+ <property>
+ <name>hbase.bucketcache.size</name>
+ <value>4196</value>
+ </property>
</configuration>
{noformat}
I used Java 17.0.12 Temurin version:
{noformat}
java -version
openjdk version "17.0.12" 2024-07-16
OpenJDK Runtime Environment Temurin-17.0.12+7 (build 17.0.12+7)
OpenJDK 64-Bit Server VM Temurin-17.0.12+7 (build 17.0.12+7, mixed mode,
sharing){noformat}
Complied HBase and then started HBase in standalone mode:
{noformat}
mvn clean install -DskipTests && bin/start-hbase.sh{noformat}
Opened the RegionServer web UI and in the Block Cache section clicked on L2
tab, then clicked on `View block cache as JSON` and it was successful for me -
no error:
!image-2025-12-10-12-59-22-533.png|width=957,height=653!
Can you please share on which branch did you experienced this? What is your
Java version and what is your configuration?
> Error occurs when clicking View L2 block cache as json in UI
> ------------------------------------------------------------
>
> Key: HBASE-29768
> URL: https://issues.apache.org/jira/browse/HBASE-29768
> Project: HBase
> Issue Type: Bug
> Components: BlockCache, UI
> Reporter: guluo
> Priority: Major
> Attachments: image-2025-12-10-12-59-22-533.png
>
>
> When L2 BlockCache is enabled, opening the RegionServer’s L2 BlockCache UI
> and clicking `View block cache as JSON` will cause the following errors.
> Caused by:
> org.apache.hbase.thirdparty.com.google.gson.JsonIOException: Failed making
> field 'java.security.AccessControlContext#context' accessible; either
> increase its visibility or write a custom TypeAdapter for its declaring type.
> See
> https://github.com/google/gson/blob/main/Troubleshooting.md#reflection-inaccessible
> at
> org.apache.hbase.thirdparty.com.google.gson.internal.reflect.ReflectionHelper.makeAccessible(ReflectionHelper.java:76)
> at
> org.apache.hbase.thirdparty.com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:388)
> at
> org.apache.hbase.thirdparty.com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:161)
> at org.apache.hbase.thirdparty.com.google.gson.Gson.getAdapter(Gson.java:628)
> at
> org.apache.hbase.thirdparty.com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.createBoundField(ReflectiveTypeAdapterFactory.java:201)
> at
> org.apache.hbase.thirdparty.com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:395)
> at
> org.apache.hbase.thirdparty.com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:161)
> at org.apache.hbase.thirdparty.com.google.gson.Gson.getAdapter(Gson.java:628)
>
>
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