Ignore some SpotBugs warnings.

Author: greenrobot-team

objectbox-java/build.gradle

@@ -9,10 +9,13 @@ dependencies {
     implementation 'org.greenrobot:essentials:3.0.0-RC1'
     implementation 'com.google.flatbuffers:flatbuffers-java:1.12.0'
     api 'com.google.code.findbugs:jsr305:3.0.2'
+
+    compileOnly 'com.github.spotbugs:spotbugs-annotations:4.0.4'
 }
 
 spotbugs {
     ignoreFailures = true
+    excludeFilter = file("spotbugs-exclude.xml")
 }
 
 javadoc {

objectbox-java/spotbugs-exclude.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<FindBugsFilter>
+    <Match>
+        <!-- Exclude FlatBuffers generated code. -->
+        <Class name="~io\.objectbox\.model\.Model.*" />
+    </Match>
+</FindBugsFilter>

objectbox-java/src/main/java/io/objectbox/ideasonly/ModelModifier.java

@@ -16,6 +16,8 @@
 
 package io.objectbox.ideasonly;
 
+import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
+
 public class ModelModifier {
     public class EntityModifier {
         final String schemaName;
@@ -37,6 +39,7 @@ public PropertyModifier property(String name) {
         }
     }
 
+    @SuppressFBWarnings // Class may be static, ignore as this is an idea only.
     public class PropertyModifier {
         final String name;
         final EntityModifier entityModifier;