Version 1.0 done

.gitignore

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+# User-specific stuff
+.idea/
+
+*.iml
+*.ipr
+*.iws
+
+# IntelliJ
+out/
+
+# Compiled class file
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Package Files #
+*.jar
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+
+*~
+
+# temporary files which can be created if a process still has a handle open of a deleted file
+.fuse_hidden*
+
+# KDE directory preferences
+.directory
+
+# Linux trash folder which might appear on any partition or disk
+.Trash-*
+
+# .nfs files are created when an open file is removed but is still being accessed
+.nfs*
+
+# General
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+# Windows thumbnail cache files
+Thumbs.db
+Thumbs.db:encryptable
+ehthumbs.db
+ehthumbs_vista.db
+
+# Dump file
+*.stackdump
+
+# Folder config file
+[Dd]esktop.ini
+
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
+
+# Windows Installer files
+*.cab
+*.msi
+*.msix
+*.msm
+*.msp
+
+# Windows shortcuts
+*.lnk
+
+target/
+
+pom.xml.tag
+pom.xml.releaseBackup
+pom.xml.versionsBackup
+pom.xml.next
+
+release.properties
+dependency-reduced-pom.xml
+buildNumber.properties
+.mvn/timing.properties
+.mvn/wrapper/maven-wrapper.jar
+.flattened-pom.xml
+
+# Common working directory
+run/
+
+server

deploy.sh

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+#!/usr/bin/env bash
+cp target/SaplingsReplant-1.0.jar server/plugins

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <groupId>eu.benjaminkraft</groupId>
+  <artifactId>SaplingsReplant</artifactId>
+  <version>1.0</version>
+  <packaging>jar</packaging>
+
+  <name>SaplingsReplant</name>
+
+  <properties>
+    <java.version>1.8</java.version>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+  </properties>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <version>3.8.1</version>
+        <configuration>
+          <source>${java.version}</source>
+          <target>${java.version}</target>
+        </configuration>
+      </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-shade-plugin</artifactId>
+        <version>3.2.4</version>
+        <executions>
+          <execution>
+            <phase>package</phase>
+            <goals>
+              <goal>shade</goal>
+            </goals>
+          </execution>
+        </executions>
+      </plugin>
+    </plugins>
+    <resources>
+      <resource>
+        <directory>src/main/resources</directory>
+        <filtering>true</filtering>
+      </resource>
+    </resources>
+  </build>
+
+  <repositories>
+      <repository>
+          <id>spigotmc-repo</id>
+          <url>https://hub.spigotmc.org/nexus/content/repositories/snapshots/</url>
+      </repository>
+      <repository>
+          <id>sonatype</id>
+          <url>https://oss.sonatype.org/content/groups/public/</url>
+      </repository>
+  </repositories>
+
+  <dependencies>
+      <dependency>
+          <groupId>org.spigotmc</groupId>
+          <artifactId>spigot-api</artifactId>
+          <version>1.19-R0.1-SNAPSHOT</version>
+          <scope>provided</scope>
+      </dependency>
+  </dependencies>
+</project>

src/main/java/eu/benjaminkraft/saplingsreplant/SaplingsReplant.java

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+package eu.benjaminkraft.saplingsreplant;
+
+import org.bukkit.Bukkit;
+import org.bukkit.Material;
+import org.bukkit.block.Block;
+import org.bukkit.block.BlockFace;
+import org.bukkit.entity.Item;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.entity.*;
+import org.bukkit.plugin.java.JavaPlugin;
+
+import java.util.EnumSet;
+import java.util.HashSet;
+import java.util.Set;
+import java.util.logging.Logger;
+
+public final class SaplingsReplant extends JavaPlugin implements Listener {
+
+    Logger logger;
+
+    Set<Item> trackedSaplings = new HashSet<>();
+
+    @Override
+    public void onEnable() {
+        logger = getLogger();
+        getServer().getPluginManager().registerEvents(this, this);
+        Bukkit.getScheduler().runTaskTimer(this, this::handleSaplings, 0, 20);
+    }
+
+    @EventHandler
+    public void onItemSpawn(ItemSpawnEvent event) {
+        Item item = event.getEntity();
+
+        if (!isSapling(item))
+            return;
+
+        trackedSaplings.add(item);
+        logger.info("Spawn: Added Sapling to Tracking-list: " + item.getName());
+    }
+
+    @EventHandler
+    public void onEntityDropItem(EntityDropItemEvent event) {
+
+        Item item = event.getItemDrop();
+
+        if (!isSapling(item))
+            return;
+
+        trackedSaplings.add(item);
+        logger.info("Drop: Added Sapling to Tracking-list: " + item.getName());
+    }
+
+    @EventHandler
+    public void onItemDespawn(ItemDespawnEvent event) {
+        Item item = event.getEntity();
+
+        boolean removed = trackedSaplings.remove(item);
+        if (removed){
+            logger.info("Despawn: Removed Sapling from Tracking-list: " + item.getName());
+        }
+    }
+
+    @EventHandler
+    public void onItemMerge(ItemMergeEvent event) {
+        Item item = event.getEntity();
+
+        boolean removed = trackedSaplings.remove(item);
+        if (removed){
+            logger.info("Merge: Removed Sapling from Tracking-list: " + item.getName());
+        }
+    }
+
+    @EventHandler
+    public void onEntityPickupItem(EntityPickupItemEvent event) {
+        boolean removed = trackedSaplings.remove(event.getItem());
+        if (removed){
+            logger.info("Pickup: Removed Sapling from Tracking-list: " + event.getItem().getName());
+        }
+    }
+
+    private void handleSaplings() {
+        Set<Item> toRemove = new HashSet<>();
+        for (Item sapling : trackedSaplings) {
+            if (!sapling.isOnGround())
+                continue;
+
+            Block currentBlock = sapling.getLocation().getBlock();
+            if (isSapling(currentBlock.getType()))
+                continue;
+
+            Block ground = currentBlock.getRelative(BlockFace.DOWN);
+            Set<Material> allowedGrounds = EnumSet.of(
+                    Material.DIRT,
+                    Material.COARSE_DIRT,
+                    Material.ROOTED_DIRT,
+                    Material.GRASS_BLOCK
+            );
+
+            if (!allowedGrounds.contains(ground.getType()))
+                continue;
+
+            currentBlock.setType(sapling.getItemStack().getType());
+            sapling.getItemStack().setAmount(sapling.getItemStack().getAmount() - 1);
+            logger.info("Planted: Reduced Sapling Stack amount");
+
+            if (sapling.getItemStack().getAmount() == 0){
+                logger.info("Planted: Removed Sapling from Tracking-list");
+                toRemove.add(sapling);
+            }
+        }
+        trackedSaplings.removeAll(toRemove);
+    }
+
+    private boolean isSapling(Item item) {
+        return isSapling(item.getItemStack().getType());
+    }
+
+    private boolean isSapling(Material material) {
+        Set<Material> saplings = EnumSet.of(
+                Material.OAK_SAPLING,
+                Material.SPRUCE_SAPLING,
+                Material.ACACIA_SAPLING,
+                Material.BAMBOO_SAPLING,
+                Material.BIRCH_SAPLING,
+                Material.DARK_OAK_SAPLING,
+                Material.JUNGLE_SAPLING,
+                Material.POTTED_ACACIA_SAPLING,
+                Material.POTTED_BIRCH_SAPLING,
+                Material.POTTED_DARK_OAK_SAPLING,
+                Material.POTTED_JUNGLE_SAPLING,
+                Material.POTTED_OAK_SAPLING,
+                Material.POTTED_SPRUCE_SAPLING
+        );
+        return saplings.contains(material);
+    }
+
+    @Override
+    public void onDisable() {
+
+    }
+}

src/main/resources/plugin.yml

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+name: SaplingsReplant
+version: '${project.version}'
+main: eu.benjaminkraft.saplingsreplant.SaplingsReplant
+api-version: '1.19'

start.sh

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+#!/usr/bin/env bash
+cd server
+java -jar -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=*:5005 paper.jar nogui