diff -up spotbugs-4.8.5/spotbugs-ant/src/main/java/edu/umd/cs/findbugs/anttask/AbstractFindBugsTask.java.p00 spotbugs-4.8.5/spotbugs-ant/src/main/java/edu/umd/cs/findbugs/anttask/AbstractFindBugsTask.java
--- spotbugs-4.8.5/spotbugs-ant/src/main/java/edu/umd/cs/findbugs/anttask/AbstractFindBugsTask.java.p00	2024-05-31 20:55:49.513394826 +0300
+++ spotbugs-4.8.5/spotbugs-ant/src/main/java/edu/umd/cs/findbugs/anttask/AbstractFindBugsTask.java	2024-05-31 21:45:10.847030481 +0300
@@ -343,13 +343,19 @@ public abstract class AbstractFindBugsTa
                 findbugsLib = homeDir;
                 homeDir = homeDir.getParentFile();
             }
-            File findbugsLibFindBugs = new File(findbugsLib, "spotbugs.jar");
-            // log("executing using home dir [" + homeDir + "]");
-            if (findbugsLibFindBugs.exists()) {
-                findbugsEngine.setClasspath(new Path(getProject(), findbugsLibFindBugs.getPath()));
-            } else {
-                throw new IllegalArgumentException("Can't find spotbugs.jar in " + findbugsLib);
-            }
+            Path classpath=new Path(getProject());
+            for(String lib : findbugsLib.list(
+                    (dir, name)->name.endsWith(".jar")
+                        || new File(dir, name).isDirectory()))
+            {
+                File libFile=new File(findbugsLib, lib);
+                if (libFile.exists()) {
+                    classpath.add(new Path(getProject(), libFile.getPath()));
+                } else {
+                    throw new IllegalArgumentException("Can't find "+libFile+" in " + findbugsLib);
+                }
+            }
+            findbugsEngine.setClasspath(classpath);
             findbugsEngine.createJvmarg().setValue("-Dspotbugs.home=" + homeDir.getPath());
         } else {
             // Use an explicitly specified classpath and list of plugin Jars