diff --git a/.gitignore b/.gitignore
index 1bb0ab1..c014da0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,7 @@
 /java-runtime-decompiler-5.0.beta2.tar.gz
 /java-runtime-decompiler-5.0.rc1.tar.gz
 /java-runtime-decompiler-5.1.tar.gz
+/java-runtime-decompiler-6.0.0.pre.1.tar.gz
+/java-runtime-decompiler-6.0.0.pre.2.tar.gz
+/java-runtime-decompiler-6.0.0.pre.3.tar.gz
+/java-runtime-decompiler-6.1.tar.gz
diff --git a/java-runtime-decompiler b/java-runtime-decompiler
index 4357d7c..8d2082d 100644
--- a/java-runtime-decompiler
+++ b/java-runtime-decompiler
@@ -7,6 +7,15 @@
 
 . /usr/share/java-utils/java-functions
 
+echo $@ | grep -q -e "-verbose"
+verbose=$?
+
+function warning() {
+  if [ $verbose -eq 0 ] ; then
+    echo ${1} >&2
+  fi
+}
+
 # identify directory tree
 JRD=`basename $0`
 CONF_HOME=$XDG_CONFIG_HOME
@@ -41,7 +50,7 @@ _set_java_home
 set_jvm
 
 # all dependencies must be on classpath
-set_classpath java-runtime-decompiler rsyntaxtextarea byteman google-gson classpathless-compiler
+set_classpath java-runtime-decompiler rsyntaxtextarea byteman google-gson classpathless-compiler objectweb-asm
 CLASSPATH=$CLASSPATH:${JAVA_HOME}/lib/tools.jar
 
 # set path to agent automatically
@@ -58,7 +67,7 @@ for cpfile in $CP_FILES; do
 	then
 		cp $cpfile $PLUGIN_HOME
 	else
-		echo "Configuration files were not copied for $FILE_NAME - the existing configuration would be overwritten." >&2
+		warning "Configuration files were not copied for $FILE_NAME - the existing configuration would be overwritten."
 	fi
 done
 
@@ -69,11 +78,11 @@ if [ -e $AGENT ]
 then
 	if grep -Fxq $AGENT_STRING $CONFIG_FILE
 	then
-		echo "Default agent path is already set in $CONFIG_FILE. Skipping agent path setting." >&2
+		warning "Default agent path is already set in $CONFIG_FILE. Skipping agent path setting."
 	elif grep -rq $AGENT_PREFIX $CONFIG_FILE
 	then
 		RESULT_OF_GREP="$(grep -rq $AGENT_PREFIX $CONFIG_FILE)"
-		echo "Agent path is already set in $CONFIG_FILE as ${RESULT_OF_GREP}. Skipping agent path setting." >&2
+		warning "Agent path is already set in $CONFIG_FILE as ${RESULT_OF_GREP}. Skipping agent path setting."
 	else
 		echo  $AGENT_STRING >> $CONFIG_FILE
 
@@ -82,5 +91,5 @@ else
 	echo "Agent was not found and agent path was not set correctly. This has to be done manually in the decompiler GUI, or set AGENT_PATH===path_to_agent_jar in the configuration file: $CONFIG_FILE" >&2
 fi
 
-export FLAGS="$FLAGS -Djdk.attach.allowAttachSelf=true"
+export FLAGS="$FLAGS -Djdk.attach.allowAttachSelf=true --add-exports jdk.jdeps/com.sun.tools.javap=ALL-UNNAMED" # jdk11+ do not allow attach by default; jdk17 is hiding javap api
 run   "$@"
diff --git a/java-runtime-decompiler.spec b/java-runtime-decompiler.spec
index 4c9de0c..f732b91 100644
--- a/java-runtime-decompiler.spec
+++ b/java-runtime-decompiler.spec
@@ -1,6 +1,6 @@
 Summary: Application for extraction and decompilation of JVM byte code
 Name: java-runtime-decompiler
-Version: 5.1
+Version: 6.1
 Release: 1%{?dist}
 License: GPLv3
 URL: https://github.com/pmikova/java-runtime-decompiler
@@ -13,7 +13,7 @@ Patch3: rsyntaxVersion.patch
 Patch4: systemCfr.patch
 Patch5: systemJasm.patch
 Patch6: systemJcoder.patch
-
+Patch7: removeMultilineSpotbugs.patch
 
 BuildArch: noarch
 BuildRequires: maven-local
@@ -28,7 +28,7 @@ BuildRequires: maven-surefire-provider-junit5
 BuildRequires: maven-surefire
 BuildRequires: maven-surefire-plugin
 BuildRequires: maven-clean-plugin
-BuildRequires: java-11-devel
+BuildRequires: java-devel
 BuildRequires: google-gson
 BuildRequires: desktop-file-utils
 BuildRequires: classpathless-compiler
@@ -59,13 +59,23 @@ This package contains the API documentation for %{name}.
 %patch4 -p0
 %patch5 -p0
 %patch6 -p0
+%patch7 -p1
 
 %build
 pushd runtime-decompiler
 %pom_remove_plugin :maven-jar-plugin
 popd
+%pom_remove_plugin :spotbugs-maven-plugin
+%pom_remove_plugin :maven-checkstyle-plugin
+%pom_remove_plugin :formatter-maven-plugin
+%pom_remove_dep :spotbugs-annotations
+a=`find | grep ".*\.java$"`
+for x in $a ; do 
+  #grep -e ".*SuppressFBWarnings.*" $x && echo "^ $x ^"
+  sed "s/.*SuppressFBWarnings.*//g" $x -i
+done
 
-%mvn_build --xmvn-javadoc
+%mvn_build -f --xmvn-javadoc -- -Plegacy
 java -cp /usr/share/java/classpathless-compiler/classpathless-compiler.jar:runtime-decompiler/target/runtime-decompiler-%{version}.jar org.jrd.backend.data.Help > %{name}.1
 
 %install
@@ -107,6 +117,17 @@ desktop-file-install --vendor="fedora"                     \
 %license LICENSE
 
 %changelog
+* Sun Dec 26 2021 Fedora Release Engineering <releng@fedoraproject.org> - 6.0.0.pre.3-1
+- bumped sources to upstream rc candidate
+
+* Sun Dec 26 2021 Fedora Release Engineering <releng@fedoraproject.org> - 6.0.0.pre.2-1
+- bumped sources to upstream pre release
+
+* Thu Aug 12 2021 Fedora Release Engineering <releng@fedoraproject.org> - 6.0.0.pre.1-1
+- umped sources to upstream pre release
+- adapted jcoder plugin
+- todo, patch for removed plugins
+
 * Thu Aug 12 2021 Fedora Release Engineering <releng@fedoraproject.org> - 5.1-1
 - bumped to final sources
 
diff --git a/removeMultilineSpotbugs.patch b/removeMultilineSpotbugs.patch
new file mode 100644
index 0000000..51763b5
--- /dev/null
+++ b/removeMultilineSpotbugs.patch
@@ -0,0 +1,39 @@
+--- a/runtime-decompiler/src/main/java/org/jrd/backend/core/DecompilerRequestReceiver.java
++++ a/runtime-decompiler/src/main/java/org/jrd/backend/core/XDecompilerRequestReceiver.java
+@@ -262,10 +262,6 @@
+     private static class ClassesComparator implements Comparator<ClassInfo>, Serializable {
+ 
+         @SuppressWarnings({"ReturnCount", "CyclomaticComplexity"}) // comparator syntax
+-        @SuppressFBWarnings(
+-                value = "NP_NULL_ON_SOME_PATH_MIGHT_BE_INFEASIBLE",
+-                justification = "False report of possible NP dereference, despite testing both o1 & o2 for nullness."
+-        )
+         @Override
+         public int compare(ClassInfo c1, ClassInfo c2) {
+             if (c1 == null && c2 == null) {
+--- a/runtime-decompiler/src/main/java/org/jrd/backend/data/VmInfo.java
++++ a/runtime-decompiler/src/main/java/org/jrd/backend/data/XVmInfo.java
+@@ -112,10 +112,6 @@
+         this.type = local;
+     }
+ 
+-    @SuppressFBWarnings(
+-            value = "NP_LOAD_OF_KNOWN_NULL_VALUE",
+-            justification = "Classpath is only used for FS VMs, in other cases getCp() does not get called"
+-    )
+     public void setCp(List<File> cp) {
+         if (cp == null) {
+             this.cp = null;
+--- a/runtime-decompiler/src/test/java/org/jrd/frontend/frame/plugins/FileSelectorArrayRowTest.java
++++ a/runtime-decompiler/src/test/java/org/jrd/frontend/frame/plugins/XFileSelectorArrayRowTest.java
+@@ -11,9 +11,6 @@
+ import java.io.File;
+ import java.nio.file.Paths;
+ 
+-@SuppressFBWarnings(
+-        value = "DMI_HARDCODED_ABSOLUTE_FILENAME", justification = "Hardcoded paths aren't used for manipulating with an actual filesystem."
+-)
+ class FileSelectorArrayRowTest {
+     @BeforeAll
+     static void setup() {
+
diff --git a/sources b/sources
index 12c4568..2c65d53 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (java-runtime-decompiler-5.1.tar.gz) = 0a1e644696c7fc0595a9b4ca05ef1f392a78e5a6bb6e9631ede8a93776740ae8cf65ced0cfaacd7890985ee659e41947bcf17a87d7bc3ba5958ae84a943b64d9
+SHA512 (java-runtime-decompiler-6.1.tar.gz) = 41bd87f0311d47819107fbd34173e4e1cebef71eb8651a337fb71a30947ffbb6bcaea6877508e0a02b0b2fcead7fe51497ed6251329a0254a8ee48220275e86f
diff --git a/systemJcoder.patch b/systemJcoder.patch
index 1454b9e..bdbacc7 100644
--- a/systemJcoder.patch
+++ b/systemJcoder.patch
@@ -6,7 +6,7 @@
 -  "WrapperURL": "file://${XDG_CONFIG_HOME}/plugins/JcoderDecompilerWrapper.java",
 +  "WrapperURL": "file:/etc/java-runtime-decompiler/plugins/JcoderDecompilerWrapper.java",
    "DependencyURL": [
--    "file://${HOME}/.m2/repository/org/openjdk/asmtools/7.0.b10-ea/asmtools-core-7.0.b10-ea.jar"
+-    "file://${HOME}/.m2/repository/org/openjdk/asmtools/asmtools-core/7.0.b10-ea/asmtools-core-7.0.b10-ea.jar"
 +    "file:/usr/share/java/openjdk-asmtools/asmtools-core.jar"
    ],
    "DecompilerDownloadURL": "https://github.com/openjdk/asmtools"