Log DB table names.

bramble-core/src/main/java/org/briarproject/bramble/db/DatabaseTypes.java

@@ -3,15 +3,16 @@ package org.briarproject.bramble.db;
 class DatabaseTypes {
 
 	private final String hashType, secretType, binaryType;
-	private final String counterType, stringType;
+	private final String counterType, stringType, schemaQuery;
 
-	public DatabaseTypes(String hashType, String secretType, String binaryType,
+	DatabaseTypes(String hashType, String secretType, String binaryType,
-			String counterType, String stringType) {
+			String counterType, String stringType, String schemaQuery) {
 		this.hashType = hashType;
 		this.secretType = secretType;
 		this.binaryType = binaryType;
 		this.counterType = counterType;
 		this.stringType = stringType;
+		this.schemaQuery = schemaQuery;
 	}
 
 	/**
@@ -31,4 +32,8 @@ class DatabaseTypes {
 		s = s.replaceAll("_STRING", stringType);
 		return s;
 	}
+
+	String getSchemaQuery() {
+		return schemaQuery;
+	}
 }

bramble-core/src/main/java/org/briarproject/bramble/db/H2Database.java

@@ -41,8 +41,9 @@ class H2Database extends JdbcDatabase {
 	private static final String BINARY_TYPE = "BINARY";
 	private static final String COUNTER_TYPE = "INT NOT NULL AUTO_INCREMENT";
 	private static final String STRING_TYPE = "VARCHAR";
+	private static final String SCHEMA_QUERY = "SHOW TABLES";
 	private static final DatabaseTypes dbTypes = new DatabaseTypes(HASH_TYPE,
-			SECRET_TYPE, BINARY_TYPE, COUNTER_TYPE, STRING_TYPE);
+			SECRET_TYPE, BINARY_TYPE, COUNTER_TYPE, STRING_TYPE, SCHEMA_QUERY);
 
 	private final DatabaseConfig config;
 	private final String url;

bramble-core/src/main/java/org/briarproject/bramble/db/HyperSqlDatabase.java

@@ -41,8 +41,11 @@ class HyperSqlDatabase extends JdbcDatabase {
 	private static final String COUNTER_TYPE =
 			"INTEGER NOT NULL GENERATED ALWAYS AS IDENTITY(START WITH 1)";
 	private static final String STRING_TYPE = "VARCHAR";
+	private static final String SCHEMA_QUERY =
+			"SELECT TABLE_NAME FROM INFORMATION_SCHEMA.SYSTEM_TABLES"
+					+ " WHERE TABLE_TYPE='TABLE'";
 	private static final DatabaseTypes dbTypes = new DatabaseTypes(HASH_TYPE,
-			SECRET_TYPE, BINARY_TYPE, COUNTER_TYPE, STRING_TYPE);
+			SECRET_TYPE, BINARY_TYPE, COUNTER_TYPE, STRING_TYPE, SCHEMA_QUERY);
 
 	private final DatabaseConfig config;
 	private final String url;

bramble-core/src/main/java/org/briarproject/bramble/db/JdbcDatabase.java

@@ -405,6 +405,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 		boolean compact;
 		Connection txn = startTransaction();
 		try {
+			if (LOG.isLoggable(INFO)) logSchema(txn);
 			if (reopen) {
 				Settings s = getSettings(txn, DB_SETTINGS_NAMESPACE);
 				wasDirtyOnInitialisation = isDirty(s);
@@ -447,6 +448,24 @@ abstract class JdbcDatabase implements Database<Connection> {
 		return wasDirtyOnInitialisation;
 	}
 
+	private void logSchema(Connection txn) throws DbException {
+		Statement s = null;
+		ResultSet rs = null;
+		try {
+			s = txn.createStatement();
+			rs = s.executeQuery(dbTypes.getSchemaQuery());
+			StringBuilder sb = new StringBuilder("Tables:");
+			while (rs.next()) sb.append('\n').append(rs.getString(1));
+			LOG.info(sb.toString());
+			rs.close();
+			s.close();
+		} catch (SQLException e) {
+			tryToClose(rs, LOG, WARNING);
+			tryToClose(s, LOG, WARNING);
+			throw new DbException(e);
+		}
+	}
+
 	/**
 	 * Compares the schema version stored in the database with the schema
 	 * version used by the current code and applies any suitable migrations to